6. Orkut - 100M users; owned by Google; named after its creator, Google employee Orkut Buyukkokten; Popular in India and Brazil; blocked in Iran and Saudi Arabia due to the countries' censorship drive
5. Twitter - 105M users; sometimes described as the SMS of social networking because of the 140-character-only way of updating status or communicating with friends, known in twitter as followers.
4. Friendster - 115M users; founded by Jack Dorsey in 2006; more popular in Southeast Asia; the top subscribers are from the Philippines
3. 51 - 120M users(in China alone); the audience is a nation: China; (facebook and twitter are both banned in China so they have their own)
2. MySpace - 185M users; a sort of virtual audition stage to debut new tracks, share information or arrange special shows for fans of unsigned bands or musicians
1. Facebook - 400M users; founded by Mark Zuckerberg with his college roommates and fellow computer science students; The idea for Facebook came from his days at Phillips Exeter Academy which, like most colleges and prep schools, had a long-standing tradition of publishing an annual student directory with headshot photos of all students, faculty and staff known as the "Facebook"; it just started as a Harvard thing and became popular in othe universities and colleges; because of Facebook, Mark Elliot Zuckerberg (born May 14, 1984) has now a networth of $4 billion.
A book based on the founding of Facebook has been published, The Accidental Billionaires: The Founding Of Facebook, A Tale of Sex, Money, Genius, and Betrayal. This book has now been adapted into a movie, The Social Network, which will be released in October 2010, starring Jesse Eisenberg (as Mark Zuckerberg) and Justin Timberlake.
funny animated short story about social network war:
sources: wikipedia.org, onlinemarketingblog.com, news.discovery.com, imdb.com