In the second significant advertising deal Microsoft has announced today, the company will "sell and serve the ads on Digg," according to this blog post by Digg founder Kevin Rose and a Microsoft press release.

Rose compared the deal to a similar one Microsoft inked with Facebook in August 2006.

The announcement says Digg, which allows users to vote on the Web's best content, has 17 million unique visitors a month.

Other details: The deal is for three years. Microsoft is the "exclusive provider of display and contextual advertising on Digg." Microsoft will work with Digg's current advertising provider, Federated Media Publishing. Financial terms were not disclosed.