Guess I've just never thought of Twitter as bi-directional. I mean I know people tweet "at" each other and get into twitter fights, but it's difficult to have a serious discussion in a medium that is mostly one-way and SMS length-limited.
Short version - I see twitter as complementary, not competitive.
I don't think I'll ever "get" twitter. I'm not wired to understand it.
I read people tweets, people responding to someone/something and I can't figure out what it is. There isn't necessarily a direct link to something that they've responded to so it's just a comment out loose. I don't understand how ANYBODY understands twitter, really.
Twitter is for people who never want to have a conversation, directly to and fro, with anybody.