All my FB friends are conservative. We were all HS classmates. I havea about 20 of them. We all graduated in the early to mid 70s.
Yeah, I realize FB is not the same experience for everybody. My brother says the same thing.
I think the reasons FB went Left for me was 1) because I’ve always played in a band and was using FB to network among musicians, keep tabs on music venues and attract followers. Musicians and music fans tend to be liberal - at least those interested in the music we play. I’m very conservative so I’m odd man out. 2) because I have six children and I was using FB to keep tabs on them - if one of my kids posted something, or commented, I got alerted, I might make a comment, I gets friend request and pretty soon I’m FB friends with lots of my kids FB friends...and their parents.
So I guess I wasn’t very selective about my FB friends - I just let it expand on its own.
My brother did the opposite and mostly only made FB friends with people with similar political views