The Numbers Behind Twitter [INFOGRAPHIC] Launched in March 2006, Twitter has witnessed one of the fastest growth in the social media realm, with over 500 million accounts that post 9,100 tweets per second.

http://www.masters-in-finance.org/twitter/
http://socialmediatoday.com/1807521/numbers-behind-twitter?utm_source=hootsuite&utm_medium=twitter&utm_campaign%20value=hootsuite_tweets