After a Supreme Court directive, the CBI has clamped down on a man who had uploaded videos of Indian women being raped onto social networking sites. We have been closely tracking the work of the activist Sunita Krishnan and her Shame the Rapist campaign. We look at the larger issues here - the sick minds that not only film gang-rapes, but upload them for perverse thrills and sheer commerce. Can these crimes on social media be effectively stopped?