Did Last.fm Just Hand Over User Listening Data To the RIAA?
word is going around that the RIAA asked social music service Last.fm for data about its user’s listening habits to find people with unreleased tracks on their computers. And Last.fm, which is owned by CBS, actually handed the data over to the RIAA.
via Did Last.fm Just Hand Over User Listening Data To the RIAA?.
[ I think when I started using last.fm again recently, I asked someone if it wasn't just a very convenient way of giving the MAFIAA a nice index to sue users based on, and the idea was dismissed as insane 
]
Russ comments:
Of course we work with the major labels and provide them with broad statistics, as we would with any other label, but we’d never personally identify our users to a third party – that goes against everything we stand for. [1]
Update 2009-02-23: RIAA has denied this as well. Which is why I’m seriously considering the chance that such a leak occurred… 
