Do you behave differently online than you do in real life?
Of course. I don't say nearly as much in person as I write online. It's not for lack of trying though. Far too many people I find like to hear themselves talk so I can't get a word in edgewise in conversation, whereas online, what I write goes out the same as what anyone else writes, or maybe more so because feed aggregators such as Friendfeed pick it up. (Whether people read it is another matter. :) )