Last.fm

Last.fm is a music website founded in the United Kingdom in 2002. Using a music recommender system called "Audioscrobbler", Last.fm builds a detailed profile of each user's musical taste by recording details of the tracks the user listens to, either from Internet radio stations, or the user's computer or many portable music devices.

On 30 May 2007, it was acquired by CBS Interactive for £140 million (US$280 million)