Apart from Last.fm and MySpace, which sites do you use?

I really like http://www.thesixtyone.com/#/seaninsound/ - it allows you to listen to lots of tracks, browse by popularity and "heart" stuff.

I quite like http://blip.fm/profile/seaninsound for posting stuff to Twitter but not used it for a while as I keep posting Spotify playlists instead.

Which sites do you use?