Bill Day, the co-founder and former CEO of About.com, has been tapped to head video ad net ScanScout, Adweek reported. Day moves over from local online media and ad firm Marchex, who hired him in Aug. 2007 to lead its consumer-facing media business as chief media officer. Before that, Day was CEO of the adware company formerly known as WhenU (now MeMedia).

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At ScanScout, Day succeeds Waikit Lau, who co-founded the company in Cambridge, MA., with a former MIT classmate of his. Lau, who will return to his role as president, was acting CEO after Doug MacFarland left the post in December. MacFarland held the postion for one year. Lau will now return to his role as president.