About 43.5 percent of our social traffic are social networks we know.
In the early days of the web, pages of information linked to each other. Then along came web crawlers that helped you find what you wanted among all that information. Around 2003 or 2004, the social web really kicked into gear, and thereafter the web’s users began to connect with each other more and more often. Hence Web 2.0, Wikipedia, MySpace, Facebook, Twitter, etc. This is the dominant history of the web as seen, for example, in this Wikipedia entry on the ‘Social Web.’