Footnotes

1. Verna, Paul. “Inside Twitter’s ‘100 Million New Members’ Number.” Web log post. The EMarketer Blog. 13 Dec. 2010. Web. 28 Jan. 2011. <http://www.emarketer.com/blog/index.php/twitters-100-million-member-number/>.

2. Ostrow, Adam. “Twitter Hits 20 Billion Tweets.” Mashable. 31 July 2010. Web. 28 Jan. 2011. <http://mashable.com/2010/07/31/twitter-hits-20-billion-tweets/>.

3. “About Us.” LinkedIn Press Center. Web. 28 Jan. 2011. <http://press.linkedin.com/about/>.

4. “YouTube Fact Sheet.” YouTube. Web. 28 Jan. 2011. <http://www.youtube.com/t/fact_sheet>.

5. “Wikipedia: About.” Wikipedia, the Free Encyclopedia. 9 Jun. 2011. Web. <http://en.wikipedia.org/wiki/Wikipedia:About>.

6. Zickuhr, Kathryn. “Generations Online in 2010.” Pew Research ...

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