Yahoo will sell advertising on Wal-Mart sites. Combining Wal-Mart with eBay and Yahoo's other retail publishers, Yahoo advertisers can now reach 73 percent of online retail shoppers, Yahoo president Sue Decker told the Advertising 2.0 keynote audience this morning. She also announced that Yahoo added 93 newspapers to its Lighthouse consortium, bringing the number to over 400. Havas Digital will join WPP as a Yahoo agency partner.

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