People know I visit online support forums, one of which in the English language, but not that it is this forum and not my username. However, I don't doubt that if someone who knew me were to read through all my posts, they know it's me in a heartbeat. It'd be a real coincidence otherwise.

I wouldn't want anyone to know. If I complain about my mother or share an annoyance about my T or a fear of my pdoc, I don't want my mother or T or pdoc to read that.