Twitter adds nofollow to @names
I have a Firefox stylesheet that reveals which links are nofollow. And I'm fairly sure that, last time I looked, @ mentions of people's names weren't nofollowed - but now are, as this screenshot demonstrates.

@ mentions now nofollowed
Is this breaking news, or am I losing my mind?
Update I'm not. I've looked through the google cache of some tweets and this is new. And it seems I was beaten to the news ...
You are not going mad, but I probably am.
[...] to him a lot more than linking to Twitter where you can’t trust the links. It was also spotted by Malcolm before I published a few other tweeters – he wasn’t going mad, but I probably [...]