Starting in January 2012, Facebook will gradually begin showing Sponsored Stories social ads in the main news feed of the web version of the site, a representative of the company tells us. Facebook hasn’t shown ads in the news feed since 2008, so this has big ramifications for advertisers and the user experience. The ads will be marked “Sponsored” and a rate limit will ensure users see no more than 1 Sponsored Story in the news feed per day

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Facebook Sponsored Story Ads To Appear In The Web News Feed In 2012