The greatest impact of social media on the revolution that followed the iranian presidential election of 2009 was that it was used by the public to organize political protests. Hence, option A.
Iranian Revolution, also known as Islamic Revolution, popular uprising in Iran that brought about the overthrown of the monarchy in 1979, and led to the establishment of an Islamic republic.
Therefore, the influence or impact of social media on the revolution is that it was used by the public to organize political protests.
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