Do you behave differently on different websites or do you stay the same no matter where you are?

Fluther, FaceBook, MySpace, Twitter, Askville, Yahoo whatever, blogs, any place where there is an online group of people with it’s own culture—are you the same wherever you go, or do you change depending on the culture of the place you are?

If you change, how would you characterize those changes? If you stay the same, how would you characterize the personality of your core online presence. If you troll, it would be really interesting to hear how you change, and what roles you take on.