Email a copy of "CNet Exposes the 'The big Digg rig'" to a friend.
Digg became one of the top sites for tech news because it lets Web-savvy geeks decide what's newsworthy, offer up stories they like and vote on their favorites.
Now, dubious Internet marketers are planting stories, paying people to promote items, and otherwise trying to manipulate rankings on Digg and other so-called social media sites like...
