Tweet
Tweets
Tweeter
Tweeted
Shall Tweet
Having been Tweeted
Shall/will be Tweeted
Your Tweetness (reserved for Twitter royalty)
You M@*^%^ F&%ing Tweeter (reserved for those not liked)
Tweet! (Cool, also useful for Sweet!)
Tweeeeet? (Dude, are you standing behind the door with a knife?)
Tweet. (This sucks!)
Tweeted, not the other form- twa-, well you know, is acceptable for past tense usage.