When facebook has consumed your attention to the point that the only path to reality immersion is through clicking the logout button.
Dave: I think I have a problem..
Mark: What's up dude?
Dave: Well, I spent a lot of time looking at my friends photos.
Mark: How long?
Dave: when i was done i was on picture 339 of 400.
Mark: Ohhh. Serious case of face-mode. I hear Myspace is workin on a cure.