Tweets per Day over 07-08 <1M; but during 09 grow to 30M and on up in 10 to 45M (and now 100M+ world wide!).
CITATION STYLE
Twitter Com. (2010). Twitter Blog: Measuring Tweets. Twitter Blog, 2010(3.8.), offical twitter blog. Retrieved from http://blog.twitter.com/2010/02/measuring-tweets.html
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