I use Marketplace. Not sure how long that will keep working.
And I use a couple of groups who happen to own the same type of campervan that I do.
And given my camper is over 40 years old, it is nice when there are others in the same boat who've got wisdom to share (or parts).
But social media wise, I don't bother.
Yet I can't think of anything that replaces it at the moment. Musk turned Twitter into a place for racists to yell at the clouds.
And there isn't much else out there to act as a social bulletin board.
I suspect the Facebook will hang around for a while.
Strange, but it does have a noticeboard function that I know many people use.