It seems like you can know a lot now, although some people haven't been exposed to the freer forms of social media.

I pretty much use solely nostr now, but I used to do a lot on minds and mewe and a little on gab.  I liked mewe, but people didn't stick around.  I used minds a lot and it was my favorite before nostr.  I wanted to like gab, but never really got into it.  I haven't been on facebook since sometime before covid.  I never used twitter or instagram or any of the other mainstream social media.

I like nostr people even if some of the ones I liked seem to have left. 

 people who are generally free minded but only have a facebook profile they rarely use, are the kind of people who prefer the real, and the here and now. 
what we can tell isnt just ideological.