Chas Edwards (pictured here), the publisher and chief revenue officer for Digg, the social news discovery service, is leaving the San Francisco company, according to sources.

The exec, who came to Digg in May of 2009 from Federated Media, will move to a start-up called Pixazza, a photo-tagging site for advertising, "by enabling consumers to simply mouse over images to learn more and see related products."

Edwards' title at Pixazza-which confirmed the move-will be as chief revenue officer and publisher development.

The Mountain View, Calif.-based company has garnered almost $18 million in funding from Google Ventures, CMEA Ventures, August Capital, Foundation Capital and Shasta Ventures, as well as from angel investors Ron Conway, Gideon Yu and Maynard Webb.

The departure from Digg, sources said, is amicable, and Edwards will remain an adviser to the company, which has been undergoing some turmoil of late.

That's been due to a much-criticized new version of the once-hot service, as well as some management upheaval.

Digg recently appointed Matt Williams as its new CEO. He quickly apologized for the bungled relaunch of the news aggregator and has promised to fix its problems.

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