If you're a developer, there are lots of platforms which you can help out on:

BookWyrm (Goodreads alternative)
github.com/mouse-reeve/bookwyr

Funkwhale (Music, Podcasts and Audio)
dev.funkwhale.audio/funkwhale

Lemmy (Reddit alternative)
github.com/LemmyNet/lemmy

Mastodon (Twitter alternative)
github.com/tootsuite/mastodon

PeerTube (YouTube alternative)
github.com/Chocobozzz/PeerTube

PixelFed (Instagram alternative)
github.com/pixelfed/pixelfed

Write Freely (Medium alternative)
github.com/writefreely/writefr

@Theehermit

I have heard lots of good things about Bookwyrm, it's currently in a closed beta but you can request an invitation at bookwyrm.social

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