Well a couple of days ago I was introduced to something that I enjoyed very much.
The thing is called BLIP. And is all about music.
When you create your account the site will ask you 2/3 bands that you enjoy and with that it will introduce to people that already "bliped" songs from that bands and add them as your Favourit Djs. Don't worry the removal part is very easy, and somehow necessary, there are accounts that post hundreds of blips each day.
After you create you account the fun part begins. Is very easy to Blip, just look for the song and/or the band and the search engine will look in youtube, amazon, iTunes for the song. Then you have the option to message something on the blip and this way interaction begins.
You can "Prop" other peoples songs, reblip them with the goal of be a popular Dj.
You can use Blip just for recreation, find a couple of very good Djs and let them have the work of choosing the playlist for you!
Is worth a visit.
Here's the best DJ!!!