Id like to point out firstly that the majority of people that are on twitter, use either there name or name+initial or something of a similar nature as their username.
Twitter and myspace are both rubbish really anyway. I will never use Twitter and the only good thing about myspace is the option to customise your profile to exactly how you would like it.
Facebook I believe is the best of the major 3 options. I basically use it to be able to talk to old school friends that have moved away that I never see anymore, or friends that are overseas. Just keep in touch with family and friends. As is what about 98% of people do on facebook.
How using your real name to talk to your real friends and real family on facebook is a privacy breach I will never know.
Its just another case for someone to have a whinge because they're paranoid that someones out to get them I suppose.