I used to really like facebook, but Myspace any day after the recent facebook changes. But above all, I prefer Twitter.
In Brazil, India, Pakistan and other south asian countries heavily use Orkut. The use of face book and myspace is very rare in above countries. I use orkut, but also have an account at face book but is not monitored often.
I heard facebook is the largest social network but mostly, i don't use any social networks till now! Once, I have used orkut!
I like facebook. You can stay connected with people and try to get them to buy something!! Myspace has cool layouts, though.
I been using mySpace since high school, Facebook since college, and Twitter since January. LOL I gotta check out this orkut.
ı use facebook too, l never created myspace account, but as l see in social network sites myspace s getting more advertisements than facebook and more quality traffic. facebooks value is around 4 billion $ and huge network of web.
facebook because its simple and readable and loads fast and i have lots of history on it...and its 99 times less likely to be hacked/fished because they actually keep up with new web development