I keep the same username everywhere I go if I can, for branding purposes. If you see a DokiDokiTsuna anywhere on the internet, you can be 95% sure that it's me. ^^
So, every once in a while, I Google myself just to see where I'm being mentioned. I'm most famous for my Kirby fan art, apparently (although that's not really a surprise~). Although my Steam artwork came up, too. One thing I did not see was my Redbubble account, but I don't really have anything on there, so I guess it doesn't deserve to come up. XD
Do you use the same username a lot, or a bunch of different ones? What comes up when you Google your name?