LinkedIn - World's Largest Professional Network, is a business-oriented social networking site. Founded in December 2002 and launched in May 2003, it is mainly used for professional networking. As of 22 March 2011, LinkedIn reports more than 100 million registered users, spanning more than 200 countries and territories worldwide.The site is available in English, French, German, Italian, Portuguese and Spanish.

Myspace, Inc. is a leading social entertainment destination powered by the passions of fans. Aimed at a Gen Y audience, Myspace drives social interaction by providing a highly personalised experience around entertainment and connecting people to the music, celebrities, TV, movies, and games that they love. These entertainment experiences are available through multiple platforms, including online.

Ning is the world’s largest platform for creating social websites. Top organizers, marketers, influencers, and activists use Ning to create an online destination that weaves social conversations in content and inspire action. Based in Palo Alto, California, Ning makes it easy for brands of all shapes and sizes to build custom and powerful social websites.

Friendster, a pioneer and leading global online social network, is focused on helping people stay in touch with friends and discover new people and things that are important to them. Friendster is one of the best sites that allow people to meaningfully participate with others in exciting and fun ways. Friendster prides itself in delivering an easy-to-use, friendly and interactive environment where users can easily connect.

Millions of Players, One Global Community. Social gaming and entertainment for the worldwide market. hi5 is the world's leading social play network, focused on delivering a fun, interactive and immersive experience online to audiences around the world. Find friends and meet cool people like you from all over the world. Express yourself with custom profiles, avatars, music, and more

Facebook helps you connect and share with the people in your life. Facebook's mission is to give people the power to share and make the world more open and connected. Giving people the power to share and make the world more open and connected.Facebook is a social utility that connects people with friends and others who work, study and live around them. People use Facebook to keep up with friends..

Twitter is a real-time information network that connects you to the latest information about what you find interesting. Simply find the public streams you find most compelling and follow the conversations. At the heart of Twitter are small bursts of information called Tweets. Each Tweet is 140 characters in length, but don’t let the small size fool you—you can share a lot with a little space.

Other social networks are for staying in touch with people you already know. At Tagged, we make it easy to meet new people through social games, friend suggestions, browsing profiles, group interests and much more.Tagged members can express themselves by creating custom profiles to match their individual tastes. Choose from thousands of custom profile skins or make your own.