I love the idea that federation allows multiple social medias to intertwine. I'm here on Mastodon, a micro blog platform, and on Pixelfed, an Instagram alternative. Someone is developing a TikTok alternative too, I may join it as well when it is ready.
Biggest issue I've found is I never know who to follow on these other platforms. Mastodon is obvious since all my tech people are here, but I've no idea who I should be following on Pixelfed. Feels like it would be more fun if my friends were there.