Bam K. answered 01/03/15
Tutor
4.5
(12)
Multi-discipline, Passionate, and Compassionate Tutor
2005 -----> 3 million of users of social media as reported
2006 -----> 9 million ( triple of 3 million ) 1st year after the 2005 report basis for the next year which is 2007
2007 ----->27 million ( triple of 9 million ) 2nd ---------------------------------------------------------------- 2008
2008 ----->81 million ( triple of 27 million) 3rd and last year in our problem.