Click to play videoNew Delhi: On July 13, 2009, Professor HS Sabharwal murder accused walk free and the same evening a community on social networking site Facebook.com screamed for justice.
By July 15, 675 Indians pledged their support to the cause.
According to the website InsideFacebook.com, there are 3.2 million Facebook users in India - an audience that can quickly spread a message for cheap.
Campaigns for Saumya Vishwanathan, Nitish Katara, flood victims in Bihar and against the terror attacks in Mumbai have all made the headlines.
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