SNS Name | Year Created | Created by | Active Users | Description/Focus Areas |
| 2004 | Mark Zuckerberg | 1184 Million (Jan. 2014) | General social networking site |
| 2006 | Jack Dorsey | 232 Million (Jan. 2014) | Mobile social networking site, Micro-blogging |
YouTube | 2005 | Chad Hurley, Steven Chen and Jawed Karim | 1000+ Million | Video hosting/sharing site |
StumbleUpon | 2002 | Garrett Camp and Geoff Smith | 40 Million | Discovery engine, social networking |
MySpace | 2003 | Chris DeWolfe and Tom Anderson | 36 Million (Oct. 2013) | General social networking site |
LinkdIn | 2002 | Reid Hoffman | 259 Million | Business and Professional Networking |
Google+ | 2011 | Larry Page and Sergey Brin | 300 Million (Jan. 2014) | General social networking site |
| 2010 | Ben Silbermann, Paul Sciarra and Evan Sharp | 20 Million | Visual discovery tool |
Tumblr | 2007 | David Karp | 230 Million (Jan. 2014) | Social networking site, Micro-blogging |
| 2005 | Steve Guffman and Alexis Ohanian | 114.9 Million (April 2014) | Social news, social networking site |
Orkut | 2004 | Orkut Büyükkökten | Dissolved | General social networking site |