Threaded Replies and Comments with Webmentions in WordPress

Introduction to what one would consider basic web communication

A few days ago I had written a post on my website and a colleague had written a reply on his own website. Because we were both using the W3C Webmention specification on our websites, my site received the notification of his response and displayed it in the comments section of my website. (This in and of itself is really magic enough–cross website @mentions!)

To reply back to him I previously would have written a separate second post on my site in turn to reply to his, thereby fragmenting the conversation across multiple posts and making it harder to follow the conversation. (This is somewhat similar to what does with their commenting system as each reply/comment is its own standalone page.)

Instead, I’ve now been able to configure my website to allow me to write a reply directly to a response within my comments section admin UI (or even in the comments section of the original page itself), publish it, and have the comment be sent to his reply and display it there. Two copies for the price of one!

From the comments list in my Admin UI, I can write a reply and it not only lives on my site but it can now be sent as a comment to the site that made the original comment! As an example, here’s my first one and the resultant copy on the site I was replying to.

This means that now, WordPress-based websites (at least self-hosted versions running the code) can easily and simply allow multiple parties to write posts on their own sites and participate in multi-sided conversations back and forth while all parties maintain copies of all sides of the conversation on their own websites in a way that maintains all of the context. As a result, if one site should be shut down or disappear, the remaining websites will still have a fully archived copy of the entire conversation thread. (Let’s hear it for the resilience of the web!)

What is happening?

This functionality is seemingly so simple that one is left wondering:

  • “Why wasn’t this baked into WordPress (and the rest of the web) from the start?”
  • “Why wasn’t this built after the rise of Twitter, Facebook, or other websites which do this as a basic function?”
  • “How can I get it tout suite?!” (aka gimme, gimme, gimme, and right now!!!)

While seeming simple, the technical hurdles aren’t necessarily because there had previously never been a universal protocol for the web to allow it. (The Webmentions spec now makes it possible.) Sites like Facebook, Twitter, and others enable it because they’ve got a highly closed and highly customized environment that makes it a simpler problem to solve. In fact, even old-school web-based bulletin boards allowed this!

But even within social media one will immediately notice that you can’t use your Facebook account to reply to a Twitter account. And why not?! (While the web would be far better if one website or page could talk to another, these sites don’t for the simple economic reason that they want you using only their site and not others, and not enabling this functionality keeps you locked into what they’re selling.)

I’ll detail the basic set up below, but thought that it would be highly illustrative to have a diagram of what’s physically happening in case the description above seems a bit confusing to picture properly. I’ll depict two websites, each in their own column and color-coded so that content from site A is one color while content from site B is another color.

A diagram of where comments live when sent via webmention.
Each site composes and owns its own content and sends the replies to the other site.

It really seems nearly incomprehensible to me how this hasn’t been built into the core functionality of the web from the beginning of at least the blogosphere. Yet here we are, and somehow I’m demonstrating how to do this from one WordPress site to another via the open web in 2017. To me this is the entire difference between a true Internet and just using someone else’s intranet.



While this general functionality is doable on any website, I’ll stick to enabling it specifically on WordPress, a content management system that is powering roughly 30% of all websites on the internet. You’ll naturally need your own self-hosted WordPress-based website with a few custom plugins and a modern semantic-based theme. (Those interested in setting it up on other platforms are more than welcome to explore the resources of the IndieWeb wiki and their chat which has a wealth of resources.)


As a minimum set you’ll want to have the following list of plugins enabled and configured:

Other instructions and help for setting these up and configuring them can be found on the IndieWeb wiki, though not all of the steps there are necessarily required for this functionality.


Ideally this all should function regardless of the theme you have chosen, but WordPress only provides the most basic support for microformats version 1 and doesn’t support the more modern version 2 out of the box. As a result, the display of comments from site to site may be a bit wonky depending on how supportive your particular theme is of the microformats standards. As you can see I’m using a relatively standard version of the TwentySixteen theme without a lot of customization and getting some reasonable results. If you have a choice, I’d recommend one of the following specific themes which have solid semantic markup:


The final plugin that enables sending comments from one comment section to another is the WordPress Webmention for Comments plugin. As it is still somewhat experimental and is not available in the WordPress repository, you’ll need to download it from GitHub and activate it. That’s it! There aren’t any settings or anything else to configure.


With the plugin installed, you should now be able to send comments and replies to replies directly within your comments admin UI (or directly within your comments section in individual pages, though this can not require additional clicks to get there, but you also don’t have the benefit of the admin editor either).

There is one current caveat however. For the plugin to actually send the webmention properly, it will need to have a URL in your reply that includes the microformats u-in-reply-to class. Currently you’ll need to do this manually until the plugin can properly parse and target the fragmentions for the comments properly. I hope the functionality can be added to the plugin to make the experience seamless in the future.

So what does this u-in-reply-to part actually look like? Here’s an example of the one I used to send my reply:

<a class="u-in-reply-to" href="">Khürt</a>

The class tells the receiving site that the webmention is a reply and to display it as such and the URL is necessary for your webmention plugin to know where to send the notification. You’d simply need to change the URL and the word (or words) that appear between the anchor tags.

If you want to have a hidden link and still send a webmention you could potentially add your link to a zero width space as well. This would look like the following:

<a class="u-in-reply-to" href="">&​#8203;​</a>

Based on my experiments, using a <link> via HTML will work, but it will send it as a plain webmention to the site and it won’t show up natively as a reply.

Sadly, a plain text reply doesn’t work (yet), but hopefully some simple changes could be made to force it to using the common fragmentions pattern that WordPress uses for replies.

Interestingly this capability has been around for a while, it just hasn’t been well documented or described. I hope now that those with WordPress sites that already support Webmentions will have a better idea what this plugin is doing and how works.


Eventually one might expect that all the bugs in the system get worked out and the sub-plugin for sending comment Webmentions will be rolled up into the main Webmentions plugin, which incidentally handles fragmentions already.


In addition to the notes above, I will say that this is still technically experimental code not running on many websites, so its functionality may not be exact or perfect in actual use, though in experimenting with it I have found it to be very stable. I would recommend checking that the replies actually post to the receiving site, which incidentally must be able to accept webmentions. If the receiving website doesn’t have webmention support, one will need to manually cut and paste the content there (and likely check the receive notification of replies via email, so you can stay apprised of future replies).

You can check the receiving site’s webmention support in most browsers by right clicking and viewing the pages source. Within the source one should see code in the <head> section of the page which indicates there is a webmention endpoint. Here is an example of the code typically injected into WordPress websites that you’d be looking for:

<link rel="webmention" href="" />
<link rel="" href="" />

Also keep in mind that some users moderate their comments, so that even though your mention was sent, they may need to approve it prior to it displaying on the page.

If you do notice problems or issues or have quirks, please file the issue with as full a description of what you did and what resulted as you can so that it can be troubleshot and made to work not only for you, but hopefully work better for everyone else.

Give it a try

So you’ve implemented everything above? Go ahead and write a reply on your own WordPress website and send me a webmention! I’ll do my best to reply directly to you so you can send another reply to make sure you’ve got things working properly.

Once you’re set, go forward and continue helping to make the web a better place.

Special Thanks

I wanted to take a moment to give special thanks to Aaron Parecki, Matthias Pfefferle, and David Shanske who have done most of the Herculean work to get this and related functionality working. And thanks also to all who make up the IndieWeb community that are pushing the boundaries of what the web is and what it can accomplish. And finally, thanks to Khürt Williams who became the unwitting guinea pig for my first attempt at this. Thank you all!


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Reply to Creating an Archive of a Set of Tweets by Aaron Davis

Creating an Archive of a Set of Tweets by Aaron DavisAaron Davis (
I really like Barnes’ intent to share. I just wonder if there is a means of owning these notes. Ideally, taking a POSSE approach, she might live blog and post this to Twitter. I vaguely remember Chris Aldrich sharing something about this recently, but the reference escapes me. This is also limited with her blog being located at I therefore wondered about the option of pasting the content of the tweets into a blog as an archive.

Aaron, the process I use for taking longer streams of Tweets to own them (via PESOS) has Kevin Marks‘ excellent tool Noter Live at its core. Noter Live allows you to log in via Twitter and tweet(storm) from it directly. As its original intent was for live-tweeting at conferences and events, it has some useful built in tools for storing the names of multiple speakers (in advance, or even quickly on the fly) as well as auto-hashtagging your conversation. (I love it so much I took the time to write and contribute a user-manual.)

The best part is that it not only organically threads your tweets together into one continuing conversation, but it also gives you a modified output including the appropriate HTML and microformats classes so that you can cut and paste the entire thread and simply dump it into your favorite CMS and publish it as a standard blog post. (It also strips out the hashtags and repeated speaker references in a nice way.) With a small modification, you can also get your site to add hovercards to your post as well. I’ll also note in passing that it’s also been recently updated to support the longer 280 characters too.

The canonical version I use as an example of what this all looks like is this post: Notes from Day 1 of Dodging the Memory Hole: Saving Online News | Thursday, October 13, 2016.

Another shorter tweetstorm which also has u-syndication links for all of the individual tweets can be found at Indieweb and Education Tweetstorm. This one has the benefit of pulling in all the resultant conversations around my tweetstorm with backfeed from, though they’re not necessarily threaded properly in the comments the way I would ultimately like. As you mention in the last paragraph that having the links to the syndicated copies would be useful, I’ll note that I’ve already submitted it as an issue to Noter Live’s GitHub repo. In some sense, the entire Twitter thread is connected, so having the original tweet URL gives you most of the context, though it isn’t enough for all of the back feed by common methods ( presently.

I’ll also note that I’ve recently heard from a reputable source about a WordPress specific tool called Publishiza that may be useful in this way, but I’ve not had the chance to play with it yet myself.


Clearly, you can embed Tweets, often by adding the URL. However, there are more and more people deleting their Tweets and if you embed something that is deleted, this content is then lost. (Not sure where this leaves Storify etc.)

It’s interesting that you ask where this leaves Storify, because literally as I was reading your piece, I got a pop-up notification announcing that Storify was going to be shut down altogether!! (It sounds to me like you may have been unaware when you wrote your note. So Storify and those using it are in more dire circumstances than you had imagined.)

It’s yet another reason in a very long list why one needs to have and own their own digital presence.

As for people deleting their tweets, I’ll note that by doing a full embed (instead of just using a URL) from Twitter to WordPress (or using Noter Live), that the original text is preserved so that even if the original is deleted, a full archival copy of the original still exists.

Also somewhat related in flavor for the mechanism you’re discussing, I also often use Hypothesis to comment on, highlight, and annotate on web pages for academic/research uses. To save these annotations, I’ll add hashtags to the annotations within Hypothesis and then use Kris Shaffer’s excellent Hypothesis Aggregator plugin to parse the data and pull it in the specific parts I want. Though here again, either Hypothesis as a service or the plugin itself may ultimately fail, so I will copy/paste the raw HTML from its output to post onto my site for future safekeeping. In some sense I’m using the plugin as a simple tool to make the transcription and data transport much easier/quicker.

I hope these tips make it easier for you and others to better collect your content and display it for later consumption and archival use.

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👓 Who Owns L.A. Weekly? | L.A. Weekly

Who Owns L.A. Weekly? by Keith Plocek (L.A. Weekly)
Who owns the publication you’re reading right now? It’s a question you should ask no matter what you’re reading. In Latin there’s a phrase cui bono, which roughly translates as “who is benefiting?” It’s a good idea to know who is profiting in any situation. Why? So you can make educated decisions.

If things are as potentially as nefarious as they sound here, I’m archiving a copy of this article to the Internet Archive now, just in case the new owners notice and it disappears.

Reply to Pingbacks: hiding in plain sight by Ian Guest

Pingbacks: hiding in plain sight by Ian Guest (Marginal Notes)
Wait! Aren’t you researching Twitter? I am indeed and the preceding discussion has largely centred on pingbacks, a feature of blogs, rather than microblogs. I have two points to make here: firstly that microblogs and Twitter may have features which function in a similar way to pingbacks. The retweet for example provides a similar link to a text or resource that someone else has produced. I’ll admit that it has less permanence than a pingback, patiently ensconced at the foot of a blog and ready to whisk the reader off to the linked blog, but then the structure and function of Twitter is one of flow and change when compared with a blog; it’s a different beast. The second is that my point of entry to the blogs and their interconnected web of enabling pingbacks was a tweet. Two actually. Andrea’s tweet took me to another tweet which referenced Aditi’s blog post; had I not been on Twitter and had Andrea and I not made a connection through that platform, the likelihood of me ever being aware of Aditi’s post and the learning opportunities that it and its wider assemblage brings together would be minimal.

I’m finding your short study and thoughts on pingbacks while I was thinking about Webmentions (and a particular issue that Aaron Davis was having with them) after having spent a chunk of the day remotely following the Dodging the Memory Hole 2017 conference at the Internet Archive in San Francisco.

It’s made me realize that one of the bigger values of the iteration that Webmentions has over its predecessor pingbacks and trackbacks is that at least a snapshot of the content has captured on the receiving site. As you’ve noted that while the receiving site has the scant data from the pingback, there’s not much to look at in general and even less when the sending site has disappeared from the web. In the case of Webmentions, even if the sending site has disappeared from the web, the receiving site can still potentially display more of that missing content if it wishes. Within the WordPress ecosystem simple mentions only show the indication that the article was mentioned, but hiding within the actual database on the back end is a copy of the post itself. With a few quick changes to make the “mention” into a “reply” the content of the original post can be quickly uncovered/recovered. (I do wonder a bit if you cross-referenced the Internet Archive or other sources in your search to attempt to recover those lost links.)

I will admit that I recall the Webmention spec allowing a site to modify and/or update its replies/webmentions, but in practice I’m not sure how many sites actually implement this functionality, so from an archiveal standpoint it’s probably pretty solid/stable at the moment.

Separately, I also find myself looking at your small example and how you’ve expanded it out a level or two within your network to see how it spread. This reminds me of Ryan Barrrett’s work from earlier this year on the IndieWeb network in creating the Indie Map tool which he used to show the interconnections between over three thousand people (or their websites) using links like Webmentions. Depending on your broader study, it might make an interesting example to look at and/or perhaps some code to extend?

With particular regard to your paragraph under “Wait! Aren’t you researching Twitter?” I thought I’d point you to a hybrid approach of melding some of Twitter and older/traditional blogs together. I personally post everything to my own website first and syndicate it to Twitter and then backfeed all of the replies, comments, and reactions via using webmentions. While there aren’t a lot of users on the internet doing something like this at the moment, it may provide a very different microcosm for you to take a look at. I’ve even patched together a means to allow people to @mention me on Twitter that sends the data to my personal website as a means of communication.

After a bit of poking around, I was also glad to find a fellow netizen who is also consciously using their website as a commonplace book of sorts.

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