2018-12-20 UTC
# ↩️ there's a lot more, than that. See https://indieweb.org/Webmention , https://indieweb.org/WebSub , https://indieweb.org/Micropub and https://www.w3.org/TR/activitystreams-core/ for a start. ( twitter.com/_/status/1075780975357976581)