Why Scientists won't use Twitter?

Asks Nachiket Vartak:

Twitter doesn't need an introduction. The microblogging service is widely popular, and most Twitter users swear by its wonderful utility. It is a "Social Commons", as one enthusiastic web junkie put it. But a few months into using Twitter, I realised that there are very few scientists - and I mean natural scientists, on Twitter. For instance, at the time of writing this post, the Twitter account science had 2,247 followers , while some popular individuals have followers 10-fold that number.

Here are 211 scientific twitterers you may be familiar with - definitely a good start!