I am an inveterate Twitter-er, with the second-most Tweets of anyone on Kotaku's staff. I'll interrupt a game to bash out a 140-character punchline to something that just happened or occurred to me in one. It's just my nature. After locking myself out of my bathroom and resolving the matter by literally kicking down the door, my next act was to hit TweetDeck and brag about it.
Tweeting mid-game requires me to pause, come upstairs, type in a password to wake up my computer, write the Tweet and press Enter. All of that is more user friendly than the Twitter application within the Xbox 360, which will be yanked—along with the Facebook app—when the new dashboard update arrives.