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LinkedIn - about 259,000,000 registered users.Linkedin is the social network for work professionals created by Reid Hoffman in 2002. There are 161 million professionals worldwide who have connected with Linkedin since its official launch in May 2003.

Formspring - about 300,000,000 registered users.Formspring helps people find out more about each other by sharing interesting & personal responses. It starts by directly asking people original questions in anticipation of their entertaining or revealing responses. Responses can range from straightforward to surprising, and can lead to understanding and learning more about other people.

Habbo  - about 270,000,000 registered users.Habbo Hotel is a place for teens to have fun and a good time. From the very first moment teens step into our virtual Hotel, we want them to know that they can enjoy themselves without offending anyone and that being tolerant when it comes to the opinions of and differences between others is the way to go.

Instagram - about 150,000,000 registered users.A photo and video sharing site.Instagram is a mobile photo application developed by Kevin Systrom and Mike Krieger. It uses a cell phone camera to take pictures, after which users can apply photo filters and share them on the web to Twitter, Facebook, Tumblr and Flickr. The service surpassed 50 million in users shortly after opening the app to Android customers

Friendster - about 100,000,000 registered users.First launched in 2002, Friendster attracted tens of millions of users over the years, but it never quite grew into the online juggernaut it could have been.

Classmates.com - about 50,000,000 registered users.Classmates is a social networking site that helps members find, connect, and keep in touch with friends and acquaintances.

Bebo  - about 120,000,000 registered users.Bebo was founded by Michael and Xochi Birch in 2005. Bebo has steadily risen to become one of the world’s most popular social networking sites.

Myspace - about 35,000,000 registered users.Myspace is a social networking service with a strong music emphasis owned by Specific Media LLC and pop music singer and actor Justin Timberlake. Myspace was launched in August 2003

Orkut - about 100,000,000 registered users.Orkut is a social networking service owned and operated by Google.Originally hosted in California, in August 2008 Google announced that Orkut will be fully managed and operated in Brazil, by Google Brazil, in the city of Belo Horizonte.

Sonico.com - about 50,000,000 registered users.Popular in Latin America and Spanish and Portuguese speaking regions. Users can search and add friends, update their own personal profile, manage their privacy, Founded: July 28, 2007

Tumblr - about 110,000,000 registered users.Founded in february 2007.Tumblr is a microblogging social network site founded by David Karp and Marco Arment. The interface allows users to post still images, animated GIFs, videos, links, quotes and other text. Members of the site can follow other Tumblr pages that can be viewed on their dashboard, and can “reblog” or “heart” other user’s posts.

Flickr - about 40,000,000 registered users.Flickr is a photo sharing website and web services suite, and an online community platform, which is generally considered an early example of a Web 2.0 application. In addition to being a popular Web site for users to share personal photographs, the service is widely used by bloggers as a photo repository.

VKontakte - about 220,000,000 registered users. Founder of Russia's largest social network Vkontakte, is Pavel Durov in October 2006. VKontakte (VK) is Europe's largest social networking website.It is most popular in Russia, Ukraine, Kazakhstan, Moldova and Belarus. VKontakte allows users to message their friends privately or publicly, create groups and public pages, share and tag images and videos, and play games. VKontakte is the fourth-most visited site in Russia.

Yahoo! Groups - about 115,000,000 registered users.Yahoo groups and other cyber-networks are forums to keep the CI world communities connected and informed. Announcements and information about classes, jams, and other events or news are shared here as well as other CI related questions and answers. Groups tend to be started to serve specific regions and/or topics of interest.

Friends+Me automatically shares content from Google+ to other social networks by checking your Google+ business page and/or personal profile at regular intervals.Friends+Me it is a tool, that once connected to your Google+ account will broadcast what you post on Google+ to your other social networks according to a schedule you define. Currently, you can post to a Facebook Profile, Page or Goup, Twitter Account, LinkedIn Profile, Group or Page and even your Tumblr blog.

Youtube -YouTube was founded in February 2005 and has become the go-to site for video on the web.Nothing quite compares to YouTube when it comes to video sharing.

Reddit - Reddit is a social news website that displays news based on your personal preferences and what the community likes.Was launched in 2005.Users may vote the posted links up or down, causing them to appear more or less prominently on the reddit home page. Users who submit articles which other users like and subsequently "vote up" receive "karma", points which a user receives as a reward for submitting interesting articles.

Pinterest - Pinterest is a social bookmarking site where users collect and share photos of their favorite events, interests and hobbies. One of the fastest growing social networks online, Pinterest is the third-largest such network behind only Facebook and Twitter.

StumbleUpon - StumbleUpon was originally founded in 2002 by Geoff Smith, Garrett Camp and Justin LaFrance.StumbleUpon could probably be called a Web browser plug-in, an online social network, an online social bookmarking network, an online social search engine -- basically StumbleUpon is an example of software that has many roles.

Vimeo  - Vimeo launched support for high definition video in October 2007.Is a popular video sharing website that is largely characterized by content created and uploaded by artists, musicians and indie filmmakers who would like to share their creative work.

LiveJournal - LiveJournal is a journaling platform where users find friends and communities based on common interests. Since 1999 LiveJournal has been home to a wide array of creative individuals looking to share common interests, meet new friends, and express themselves.