Social networking- depends who is your target audience. Myspace is for teenage mainstream kids. Thats why all the TV shows and upcoming artists have it. Deviant art is not really a social network site. Its not about you and showing so you are. Its about the person's art and thats all you care about. I remember back with all the small sites like rate me or whatever it was called and migente, blackplanet, asian ave, ect. Those where the ones mainstream kids went to back then.
I would say block video's and mp3's. Why do they put like 4 videos on pages and play at the same time.. don't know. Myspace really has it all went to comes to the mainstream. Maybe you should approach this social site for a group of people. For example, tech people, ect.