I'm still a member of the restricted Pleasure-way group. I seldom participate unless there is a general RVing question like Harvest Host or going to Alaska, for instance two recent threads I participated in, or a question about the Pleasure-way Plateau of the era I owned it. It is getting less and less participation as time goes by and my brain cells dropping knowledge. It is more of a social club as they do have large gatherings at campgrounds.
Also, with Class C's getting more dominant in that group, I've lost interest.
The Mike Wendland RV Lifestyle group, formerly Roadtrek, is getting way irrelevant as there are more trailer and Class A members posting of which I have nothing in common.
The Sprinter Build Out International, a 26,000 member group, is the most informative for me. It is strictly Sprinter Vans and a lot of DIY info and ideas and, of course, I don't have to weed through Promaster, Transit and Chevy post that don't specifically relate.
Three things Facebook has got an advantage, 1) they have the most people on any platform, thus the widest audience, 2) There's millions of groups so you can drill down to find your best fit, and 3) posting is easier especially posting of informative photos.
Me? I am mostly busy with my one group I created 11 years ago of 40,000 members talking about one silly sandwich sold in the Midwest that one member said today in a post it would take 17 cheese slices to cover that sandwich.