Myspace actually did keep a niche going with musicians for quite some time after its general popularity had waned. No idea why that was or if there's even any of that left.
Sorry to say it but its been a few years since I started to consider FB "useds" lame (just to use your word, but I would describe them with harsher terms). It seems my side of the fence is growing in numbers pretty fast lately.
eg. like having a myspace, or a .hotmail, or a @aol email account
Social networks have to be both useful and trendy in order to fully succeed....
messenger and whatsup are both very useful, FB itself is less, and it needs to be somewhat trendy in order to survive
Personally I find fb very useful to keep up with family and friends, but that might be not be the same for other people, especially very young folks