A very interesting, unscientific study has been posted concerning the legitimacy of Digg's voting system. This blogger ran some tests on some of the top bloggers at Digg and found that many of them are voting for each other's stories early and at a rapid pace.

Digg has a way of ranking stories - entirely by the users themselves. In essence, the highest-ranked stories end up on the front page of Digg, netting the highest exposure. If, in fact, these voting structures are rigged it means that other bloggers are at an immediate disadvantage. Other, equally or even more important stories may not get noticed at all.

It's especially concerning for those businesses that use sites such as Digg to increase brand awareness or promote their business blog. The article and many comments can be read here.