I like to think I'm just vague enough that people won't be able to figure out who I am. However, this is a username I use on a number of websites, and someone who met me in real life and then stumbled across my profile would probably be able to figure it out pretty easily. I suppose I share the same mentality as a number of people have already mentioned on here. I try to make sure that nobody would want to dox me. I like to think I'm fairly innocuous online anyway, I spend more time lurking than anything else. Another thing is that I don't really have much to gain by associating my 'real-world' self with my online self. I don't post much of my own content online, and what I do post I'm happy only posting under a pseudonym. The only time that personal information has ever really come out is when it's necessary for some anecdote, or when I'm discussing cultural differences, etc.