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Old 8th September 2012
Lives for gear
Well lastfm started out as something called audioscrobbler several years ago which is an itunes plugin that tracks all of your itunes listens. And when you join it imports all of your past playcounts. Now they track spotify plays as well.

So it's not just people listening to's streaming radio service. For example when I listen to stuff in my car on my iphone it scrobbles everything I listen to and then syncs it back up to when I plug in my iphone. CDs played on your computer through itunes would be tracked as well.

Of course it's not a foolproof system. There have been a few times that I accidentally left my ipod playing an album on repeat with the sound off and racked up a ridiculous amount of plays. but if you're nerdy and picky about it you can go in and delete errors like that even.