Over the last (almost) two years we have learned a lot about the user base and how to defend digg from spam, artificial diggs, and digg fraud. It's a battle we will continue to fight and one that we don't take lightly.
That said, today we read a couple blog posts that highlight users digging each others stories. This is something we encourage through our friends features and will continue to expand as digg evolves. It is our goal to create a platform in which you can share and promote news that is important to you. What is changing however is how we are handling story promotion. While we don't disclose exactly how story promotion works (to prevent gaming the system), I can say that a key update is coming soon. This algorithm update will look at the unique digging diversity of the individuals digging the story. Users that follow a gaming pattern will have less promotion weight. This doesn't mean that the story won't be promoted, it just means that a more diverse pool of individuals will be need to deem the story homepage-worthy.
Changes are coming to our top users page as well. In the near future you will see two tabs - 'Top Diggers' and 'Top Submitters'. Top diggers will be a ranked list of people that find/digg (not submit) stories that become popular. This list will also be sorted by how diverse the digger is - meaning if they digg stories from lots of different people and their stories become popular, they'll rank highly.
In the end digg is yours to control. No matter which stories are promoted, it's up to the masses to digg or bury them. If you see content you disagree with - bury it. If enough people do the same, the system will automatically remove the story.
More features and news coming soon!