Pew Internet have published some interesting data about the adoption of social networking in the US - access it here http://bit.ly/PewDec2012
If you would like to read my summary of the research you can find it at http://bit.ly/PewResearchDec2012
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The adoption of social networking by US adults headline data from Pew Internet Research
1. 67% of online adults use Facebook
13% of online adults use Instagram
20% of online adults use LinkedIn
15% of online adults use Pinterest
16% of online adults use Twitter
56% of internet users curate or create content
Source: Pew Research December 2012
Summary report: http://bit.ly/PewResearchDec2012