I never had a myspace account. I was under the impression it was for kids. I felt I was too old for it, and had absolutely no interest.
The only reason I joined facebook was to get in touch with people I lost track of. I rarely check my account. I do it maybe once a month. I check my Twitter, which I only opened to do prizes from Eden (and I have NEVER won) more frequently than facebook, but not really often.
I don't know about the other things.