Perhaps social media tools are amplifying dissenting voices in Iran, but I'd argue it's more of a consequence of the Iranian government's policies than anything else. Skepticism of the electoral process wouldn't have arisen in the first place if it were open and there existed institutions (i.e. free press) to protect against exploitation. If there was more independently verifiable information provided by the Iranian government, rumors and exaggerations wouldn't explode through these communication mediums. Data wants to be free. Let it :)