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Rick Burnes, “Twitter User Growth Slowed from Peak of 13% in March 2009 to 3.5% in

October,”

Hubspot

Blog,

19/1/2010.

http://blog.hubspot.com/blog/tabid/6307/bid/5496/Twitter-User-Growth-Slowed-From-Peak-
of-13-in-March-2009-to-3-5-in-October.aspx.