1. Battelle, J. (2009). Comparing Twitter’s growth to Facebook and Google. Retrieved from http://www.businessinsider.com/comparing-twitters-growth-to-facebook-and-google-2009-3
2. Beaumont, C. (2010, January 16). New York plane crash: Twitter breaks the news, again. Retrieved from http://www.telegraph.co.uk/technology/twitter/4269765/New-York-plane-crash-Twitter-breaks-the-news-again.html
3. Battle of the brands.;K.Benjamin;Revolution (Staten Island, N.Y.),2009
4. Chicken & Egg: Competition among Intermediation Service Providers
5. Carson, N. (2008) Yahoo employee twitters through layoff. Retrieved from http://www.businessinsider.com/2008/12/twittering-the-yahoo-layoffs-yhoo