Everyone should check out Fork Awesome. Like the name implies it's a fork of Font Awesome: https://forkawesome.github.io/Fork-Awesome/
Recently Font Awesome has been going in a more corporate direction and seem to be adding less icons people actually want and more random ones people didn't really ask for.
Fork Awesome is based off pre-5.0 Font Awesome and adds icons like Diaspora, Mastodon, GNU Social, XMPP and even an icon for ActivityPub itself
If you don't know the details about why FA 5.0 is a bit controversial:
Font Awesome now has a "Free" and a "Pro" version.
Font Awesome's recommended usage is now SVG via JS. Meaning you load their JS and it jams SVGs into your page. Fork Awesome retains the old CSS-only approach.
Font Awesome seems to really care little about requests (e.g the Request for a Diaspora icon was opened in 2012, but there's still nothing: https://github.com/FortAwesome/Font-Awesome/issues/414) although that's not 5.0 specific
Good news. I was about to give up on Font Awesome...
The awesomeness was kind of gone... Glad it's back!