And not everyone tweets all the mundane stuff in their lives, like going to the toilet.

Some of my friends back in the UK use twitter. I have their feeds in my RSS reader, and it keeps me up to date with what they're doing. For example, this weekend I know they went to the rugby at Twickenham and ended up in the player's bar afterwards. I wouldn't have known that without twitter (since being a bloke, obviously I don't phone friends up and talk to them or anything like that!).