Having said that, most people don’t want to write HTML just to like or reply to something. WordPress’s Press This bookmarklets can already start a new post with a link to the page you’re currently viewing. This code adds IndieWeb microformats2 markup to that link. Combined the wordpress-webmention plugin, you can use this to respond to the current page with just two clicks.
What’s more, if you’re currently on a Facebook post or Twitter tweet, this adds the Bridgy Publish link that will reply, like, favorite, retweet, or even RSVP inside those social networks.
I’m not sure why I didn’t upgrade this ages ago when I saw it mentioned (probably because of the manual nature of the upgrade and the fact that I don’t think it’s bundled into the IndieWeb plugin for WordPress), but here we go. And this is the first post actually using the bookmarklet.