I'm not much of a twitter user but the uptake in the general public in the UK in the last two weeks is crazy - its gone from no-one to everyone in the space of a week.

Personally I think there was some kind of internal BBC briefing about using twitter for publicity - then the radio 1 jocks logged profiles all in the same weekend, started talking about it daily the week after and so started a snowball from the publicity.

Could that explain some of it?