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Edwards, who plans to take up a full-time position as Pixazza's chief revenue officer and development publisher, will remain a strategic adviser to Digg -- in particular, with Digg's ad platform strategy, he said in a personal blog post.
Edwards joined Digg in June 2009 from Federated Media.
Digg has had a tough year, following the departure of CEO Jay Adelson in April, and the delayed release of what's proved to be a hugely unpopular site overhaul. Traffic has plummeted heavily since then. At a conference in September, founder Kevin Rose said he was "burned out" and refused to confirm that he would still be working at the company by the end of 2010.