The Daily Show: “My Stalker Just Grunted On My Twitter”
techcrunch.com
techcrunch.com
Basically sums up Twitter in 140 characters.
Twittering is what happens while Life is passing you by.
That said, Shaq is amusing: http://twitter.com/THE_REAL_SHAQ
I don't have a problem with it, it's not like it hurts anything, I just think that it generally appeals to people interested in it for marketing/PR purposes or to people with insecurities. Neither of these purposes strikes me as especially noble.