What Major Social Media Platforms Would You Like To See Federated Alternatives To That Don't Exist Yet?

Pretty much in the title. Maybe you wouldn't even use it, but would like to simply see it exist for the sake of having a federated alternative.

For me, it'd be the following:

• LinkedIn
• Meetup
• Tiktok

I am on the first two, but would prefer a federated alternative. I'm not on Tiktok, but would like to see a federated alternative.

I'll admit these might not be a good idea. But as a thought experiment, I'd be curious about the community weigh in on what you all think this might look like.