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About.com: http://mashable.com/2009/09/14/twitter-2009-stats/

http://womeninbusiness.about.com/gi/o.htm?zi=1/XJ&zTi=1&sdn=womeninbusiness&cdn=money&tm=13&f=10&su=p284.9.336.ip_p560.9.336.ip_&tt=2&bt=1&bts=0&zu=http%3A//mashable.com/2009/09/14/twitter-2009-stats/

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