Last.fm is a music website that allows users to scrobble, or automatically log, songs they listen to. It has over 30 million users and 50 million free tracks available. Key features include scrobbling songs to create personalized music profiles, user accounts to follow friends and artists, artist pages with biographies and events, and groups to connect with other users. Last.fm provides benefits to both personal users, through free music and social features, and businesses, by exposing them to a large audience of potential customers worldwide.