The vast majority of online communities are anonymous. The word “anonymous” can trigger all types of reactions. On one extreme, you might have some lowlife bullying and threatening another person. On the other end, whistleblowers. Most of us live in the middle.
But these communities aren’t anonymous as much as they are “share what you want.” Frequently, people will share quite a bit. This is very common, especially in niche communities.
I manage a martial arts community and, in general, many of the members that stick around, and become invested in our community, are the same members who share a lot about themselves.