I haven't used Facebook in 10 years but my friends have shown me it. What's there to distribute? The chat functionality? The main feed is just a heavily curated stream of garbage that's vaguely influenced by your friend's list. It looks like there's nothing there other than this bizarre social pathology that's been continuously optimized and iterated to be as addictive as possible.

For chat you have XMPP, for feeds you have RSS and webpub (mastodon.) There's ical for sharing events of course.