Farmville ad brings Microsoft's Bing 400,000 new fans in one day

Remember that Microsoft Bing ad we told you about on Tuesday? You know, the one offering you three dollars in Farmville's Farm Cash just for becoming a fan of Microsoft's new search engine? Well it seems to be getting a lot of attention, as Inside Facebook points out Bing received over 400,000 new fans for its Facebook page in the single day the ad ran.

The increase represents a nearly 400% jump from the page's roughly 100,000 fans on Monday, and gives Microsoft a huge new audience of people to reach through News Feed updates, even if those people signed up more out of interest in the Farm Cash than in the search engine.