"In fact, a 1996 study found that people in communal relationships were more likely than those in exchange relationships to view demands or offers of reciprocity as a betrayal.

If, on the other hand, the ex-follower isn't a friend, you have an exchange relationship: a mutually beneficial trade in links, information, and follower counts. Funny thing is, the unfollowing doesn't really change that. Sure, you can't count the person as a follower, but you can still get perspective and yucks in 140-character bursts. Meanwhile, you contribute to their influence and follower tally. And while having a huge network is good for the ego, being in the know beats being popular any day."

I guess the same goes for CM.

I suppose communal relationships are rare
and exchange relationships are everywhere

interesting even though I don't twitter

Ah Antara, but you do Clipmark and the concept is exactly the same here.

What do you call someone who twitters?
A twitteroo?