What do you want in a social networking site?

As a music artist, I have accounts on many different social websites. Out of all of them, facebook and mocospace were my favorite ones. Mocospace was my favorite because I liked the features they offered, not only for artists, but for regular members as well. Now, mocospace doesn't have much to offer me. They took away videos, voice profiles, public blogs, and now music, but the have tons of annoying ads. So what I want to know is, what do you want from a social site?