If I had to use my real name and everyone I have ever known could find and read my blog:
a) I would have to post a lot more often or lose face. They would say “Dude, you were a computer guy, and you do nothing now. You should post at least once a day”.
b) I would have to create at least 500 fake users to friend me. Or at least start accepting those “Russian bride” ladies that keep trying to friend me. I would be embarrassed to keep my little, but highly select, group of fellow introspectors.