See Things Differently
There are now dozens of Social Network Sites, but only so many hours in the day. To help you target the most popular, the most frequently visited (global) are:
However, before you set up profiles on all these, bear in mind different sites are more popular in different countries, for instance, Bebo.com is extremely popular in the UK. Also, some SNS sites may focus on differentmusic styles making them more effective for your brand of music.
Stats courtesy of Alexa.com