One possible explanation for the disappearance of ads from Facebook's redesigned site: Facebook didn't want to place advertisers' messages on not-quite-ready pages. So much for that theory: Ads have reappeared on Facebook's beta site, placed to the right instead of the left. Why the sudden turnabout? Likely because there's an internal war raging about the placement of ads on Facebook, with stubborn founder and CEO Mark Zuckerberg the most resistant. Expect more coming and going of ads on Facebook: We hear the company is testing entirely new ad products, which may replace the current Social Ads shown here.

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