You want/need/have to know everything in the world as soon as it happens, even if its pointless to actually know it.
Any person that is part of the 10.1 million Justin Beiber followers who NEEDS to know if he's pickin his ass right now, is Twitdicted.
A person who comments on everything that pops up on their home page. Dude, you're twitdicted!
First thing you do when you wake up in the morning, check Twitter: you're twitdiced!
You wake up in the *middle* of the night to check tweets, damn you're really twitdicted! Seriously, you need help!
Any person that follows just hot girls or hot guys is not exactly twitdicted, but just a plain creeper.