Although social networking sites have been around since the mid-1990s, it is only in recent years that there has been a huge explosion of them across the web.

This article presents the list of the 30 social networks which currently have more than 25 million users. Between the list of the largest social networkscan be verified networks of various typesfrom general-purpose social networks to social networks with specific themessuch as education, photos, family or dating.

Social networks focused on certain niche interests increasingly engage people around the topics in question, and there are already hundreds of social networks with millions of members. Amplitude Net is currently making a big push into this area of thematic social networking through its ud121 social platform.

LIST OF 30 MAJOR SOCIAL NETWORKS

# Name Registered Users Type of Social Network
1 Facebook 1 500 M Generic: Photos, Videos, Blogs, Apps.
2 Qzone 611 M Generic (in Chinese only)
3 Twitter 517 M Generic: Micro-blogging, RSS, updates
4 Sina Weibo 503 M Generic: microblogging exclusively Chinese.
5 Google+ 500 M Generic: Photos, Videos, Blogs, Apps.
6 Tagged 330 M Generic
7 LinkedIn 238 M Professional Contacts
8 Vkontakte 190 M Generic: Photos, Videos, Blogs, Apps. (Very popular in Russia)
9 Renren 178 M Generic: Photos, Videos, Blogs, Apps. (Exclusively Chinese)
10 Badoo 172 M Datting Network
11 Instagram 130 M Mobile Photo Sharing
12 Habbo 100 M Generic: aimed at teenagers.
13 Douban 100 M Movies, Music and Books (Exclusively Chinese).
14 Flickr 87 M Photo Sharing
15 Netlog 84 M Generic: Photos, Videos, Blogs (Popular in Europe, Turkey)
16 MyHeritage 75 M Genealogy and Family
17 Pintrest 70 M Image Sharing / Photography
18 Odnoklassniki 65 M School Fellow Connections (Popular in Russia)
19 MyLife 60 M Generic: Personal Relationships
20 Classmates.com 55 M School Colleague Connections
21 Sonico 55 M Generic: (Popular in Latin America)
22 Viadeo 50 M Professional Contacts
23 Slideshare 50 M Sharing Presentations: PowerPoint, PDF, Keynote
24 Last.fm 48 M Music
25 Viddy 39 M Mobile Video Sharing
26 Orkut 33 M Generic: Photos, Videos, Blogs (Popular in Brazil)
27 Foursquare 33 M Personal Location Sharing, GPS
28 I drink 30 M Generic: Photos, Videos, Blogs
29 EDMODO 29 M Education: Teachers, Students and Parents
30 DeviantArt 26 M Photo and Illustration Sharing

References:
(1) http://investor.fb.com/releasedetail.cfm?ReleaseID=780093
(2) http://www.techinasia.com/tencent-q1-2013-report-wechat-has-195-million-active-users/
(3) http://semiocast.com/publications/2012_07_30_Twitter_reaches_half_a_billion_accounts_140m_in_the_US
(4) http://www.engadget.com/2013/02/21/sina-weibo-500-million/
(5) http://googleblog.blogspot.co.uk/2012/12/google-communities-and-photos.html
(6) http://therealtimereport.com/2012/02/10/social-networking-stats-tagged-tops-330-million-registered-users-rltm-scoreboard/
(7) http://venturebeat.com/2013/08/01/linkedin-reports-strong-q2-results-membership-grows-to-238m-users/
(8) http://newsroom.cisco.com/press-release-content?articleId=1156911
(9) http://www.forbes.com/sites/greatspeculations/2013/05/03/renren-rides-chinas-social-networking-and-gaming-to-3-20/
(10) http://thenextweb.com/apps/2013/02/08/social-dating-service-badoo-launches-an-ipad-app-for-its-172-million-users/
(11) http://mashable.com/2013/06/20/instagram-130-million-users/
(12) http://www.sulake.com/press/releases/habbo-reaches-100-million-registered-avatars-worldwide/
(13) http://www.forbes.com/sites/ciocentral/2012/10/25/5-things-you-need-to-know-about-chinese-social-media/
(14) http://www.theverge.com/2013/3/20/4121574/flickr-chief-markus-spiering-talks-photos-and-marissa-mayer
(15) http://netlog.appappeal.com/
(16) http://blog.myheritage.com/media-kit/
(17) http://thenextweb.com/socialmedia/2013/07/10/semiocast-pinterest-now-has-70-million-users-and-is-steadily-gaining-momentum-outside-the-us/
(18) http://rusbase.com/news/author/benhopkins/vkcom-9-world-odnoklassniki-closing-gap/
(19) http://www.businessinsider.com/mylife-app-launch-2012-1
(20) http://techcrunch.com/2012/06/11/classmates-com-parent-united-online-acquires-school-focused-friend-finder-schoolfeed/
(21) http://thenextweb.com/la/2012/11/07/latin-american-freelance-marketplace-workana-bags-500k-in-round-led-by-evenbase/
(22) http://thenextweb.com/insider/2013/01/14/pealk-viadeo/
(23) http://blog.slideshare.net/2013/05/09/10-million-presentations-uploaded-to-slideshare/
(24) http://www.skilledtests.com/wiki/Last.fm_statistics#user_accounts_at_last.fm
(25) http://www.fastcompany.com/3001477/viddys-4-part-prescription-becoming-next-big-thing
(26) http://pt.wikipedia.org/wiki/Orkut_%28site%29
(27) http://blog.foursquare.com/2013/04/11/continuing-foursquares-growth/
(28) http://blog.contentfrog.com/so-many-social-media-platforms-so-little-time/
(29) https://www.edmodo.com/about
(30) http://www.wired.com/design/2013/03/deviantart-dreamup