There are many social networks on the internet and this list represents the most well known networks.
MySpace: This social network has expanded from individuals who want to connect to people from their past to specific profile types for music artists, comedians, and film makers. Advertisements, classified ads, and other types of media help to connect people to give them additional methods for making connections and finding information.
Facebook: This social network was originally targeted at college students; specifically only users with a school email address could sign up for an account. Soon after this policy proved to be unable to compete with the growth of MySpace, membership was opened up to everyone. Many of the same features are shared between the two networks, but each network has a unique approach towards reeling in their audience.
Friendster: A social network similar to MySpace and Facebook.
MyYearbook: Another early MySpace and Facebook competitor.
Yuwie: A social network designed to mimic MySpace and offers its users money based on their participation. Pay varies in relation to the advertising revenue that the site obtains.