Face book is used world wide and is popular in all parts of the world. However, Orkut is not that popular as facebook, it is most popular in India and Brazil. Best Regards Parikshat
Myspace still has more users, although Facebook is growing much faster. For marketing towards USA and europe youre better of focusing on Facebook and myspace
Yes, orkut is targeted. Brazil + Inida. I suppose no one markets there so Facebook is definitely the best bet.
Orkut is owned by Google, I believe. Facebook seems to be the in thing nowadays. My Space seems to be passe.
According to who? http://mashable.com/2007/11/27/facebook-myspace-comscore/ Myspace is still winning.