It was good to see everyone tonight.
Here are a few things I mentioned tonight for easier reference/follow up:
For cross-posting:
* JetPack is the simplest
* WP Crosspost (for WP to WP) https://wordpress.org/plugins/wp-crosspost/
* SNAP https://wordpress.org/plugins/social-networks-auto-poster-facebook-twitter-g/
* Others are documented at https://indieweb.org/WordPress/Plugins#POSSE_Plugins

The link for WordPress University for beginners that I mentioned: https://dailypost.wordpress.com/blogging-university/

A link to the A List Apart Article I wrote recently:
https://alistapart.com/article/webmentions-enabling-better-communication-on-the-internet

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