Question 1168263
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The growing period is 6 years from March 2004 to March 2010.


So, there are 12 doubling periods.


It means that the number of web-blogs will be  2 millions times  {{{2^12}}}  in March 2010,  or


    2,000,000 * 4096 = 8192 millions.    <U>ANSWER</U>
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Solved.