Haven't signed on once. My friends and even family have one but I don't really care for it nor need it. I think its great for musicians or any kind ofimage your trying to get out.
eh. i don't really know. i prefer it over Facebook. Facebook is overrun with too many boneheaded college kids just trying to show off how drunk they get.
I use Facebook as means to keep in touch with the people I know, and sometimes I meet new people. I was addin' all of those applications for no reason atfirst...I hate 'em now.
But I use Myspace for music promotion. Peep the sig.