I feel like 75% of Mastodon are people talking about Linux. If you don’t care about Linux you feel alienated. I enjoy Mastodon and Lemmy, but the lack of more diverse subjects gets to me if I browse for too long.
Update: I took your advice and purchased a laptop for Linux, and now I care about it! Problem solved.
Confirmation bias
I don’t think I had any initial beliefs that I could have reinforced by paying attention to certain kinds of posts and people. It feels like I tend to notice the stuff I’m not into. That’s the bias I’m interested in.
However, after making that first observation, confirmation bias can certainly take it from there and inflate the number of LGBT+ people in my head.