MySpace is one of the world’s largest social networks, with about 125 million users. Originally inspired by Friendster, MySpace quickly grew to become the world’s largest social network, before being overtaken by Facebook.

Facebook is the world’s largest social network, with over 400 million users. Facebook was founded by Mark Zuckerberg in February 2004, initially as an exclusive network for Harvard students.

Launched in July 2005, Bebo has steadily risen to become one of the world’s most popular social networking sites. Users can create profiles on the site for free, stay connected with friends, watch videos, and listen to music.

Founded in 2003, hi5 today is one of the largest social entertainment sites in the world, with approximately 50 million monthly unique visitors who use the site to stay connected to friends, meet new people, share photos, and play games.

Friendster is a social networking website. Its headquarters are in Sydney, Australia. The service allows users to contact other members, maintain those contacts, and share online content and media with those contacts.

Badoo allows its users to meet new people and friends in and around their local area. It focuses on the forgotten area between social networks and dating websites, where people just want to socialize with new people and have fun.

Xanga is a free service which allows users to create their own video, audio and webblog. The site is similar to many popular social networking sites such as MySpace, Friendster and Bebo. The site is largely popular with teenagers and is successful in Asia.

With more than 45 million users representing 150 industries around the world, LinkedIn is a fast-growing professional networking site that allows members to create business contacts, search for jobs, and find potential clients.

Twitter, founded by Jack Dorsey, Biz Stone, and Evan Williams in March 2006 (launched publicly in July 2006), is a social networking and micro-blogging service that allows users to post their latest updates.

Digg is a user driven social content website. Everything on Digg is user-submitted. After you submit content, other people read your submission and “Digg” what they like best.