As a former user of Grooveshark, I was really pleased by the applications and functionalities developed by the website and that helped to build a real community of listeners. To be honnest, Spotify is quite far from that aspect, and in my opinion missing a lot of traffic.
Grooveshark launched a 'broadcast' system that allows people to create webradios (like a DJ) : other members can join that live playlist (so it means that if I'm changing the song list, of deleting a song, etc, the listeners will listen the same thing than I do).
Listeners have the possbility to suggest songs, and Broadcaster can preview these songs and eventually decide to include them, or not, in the final playlist.
Of course, a chat was also included to the broadcasting system so the broadcaster can interact with the members of his/her broadcast.
Main advantages of the broadcasting system :
- Maximizing interactions between members : Spotify is no longer a tool that only aims at listening to music, but a virtual room that allows dialogue
- Increasing members loyalty as well than overall traffic
- The 'content' creation will not be only handled by the Spotify team, broadcasters clearly take part in managing and displaying playlist : the link with Spotify as a brand would be clearly stronger
To be honnest, I am quite surprised this system was not duplicated so far.