My vote is for LinkedIn. Who actually likes using that thing?
I've never used LinkedIn for anything other than to respond to recruiters and look up people's backgrounds.
As a personal anecdote, the people I know who cut back on Twitter did so long before Musk due to general social media burnout.
I don't have an active twitter account, so one of the things I like from post-Musk Twitter is that it no longer requires me to login for reading tweets or for searching.
And the dumb shit Elon posts and all the times he kicks himself in the balls are way funnier than before he acquired 'em.
Overall, I'm happier with the site since he took over, personally. But then I'm rooting for its demise, preferably with as much drama and humor along the way as possible, so of course I like it.