Well, this has become a big talk lately and while the websites have their own share of spies and sources, here is some information. The common source of gossip contribution is from the cine folks themselves. Well, one hero passes info on other hero, one director on the other director, one producer on other producer.
Earlier, one of their gangs used to call and inform or spread it through word of mouth but now, straight emails are coming to the admin directly. This is the state of movie industry where mud slinging is the key. In all this, the media business is benefiting in a big way.