I remember exactly why Myspace got so well known. It was because everyone that was on it would tell their real life friends about it and also ask everyone they knew "are you on Myspace?" and if not they would talk them into it.
Im personally trying to be more active here by checking and occasionally commenting on recent blogs, groups, and bulletins but there's not usually that much to see. What can you do? Akd for me personally It doesn't help that most of the people here are teens so I don't even interact 90% of the users here all that much.