Myspace?

[jedimaster86]

Myspace is only more popular because it has been around for longer than Facebook (Myspace-2003, Facebook-2004) and thus has had the chance to be visited by more and have many more advertisers (thus, they can have stuff like music, videos, etc). Myspace is the top visited online community in the world (as well as the top visited site in the US), and Facebook is the second most visited online community in the world (seventh most visited site in the US if remember correctly).

Facebook is split into networks; nowadays anybody can sign up with an email address (open facebook), but upon signing up you join a network and can only see other peoples profiles in that network (thus the only way to see a buddy's profile in another network is to add them to your friends list).

Facebook already has claims to some things, for example being the top photo-sharing site on the net. This is popular because not only can you basically put as many pictures as you want up (organized into albums), but you also have the ability to "tag" these pictures, which lets you click in the picture and make a note of the people in the picture.

Myspace may always be more popular just because it already is the most popular and has an enormous amount of accounts as well as a variety of things on the site, but expect Facebook to gain more popularity and support from all (people and advertisers alike) for the niche it fills in the internet society.