(CNN) -- If Black Friday lines and stories of violence, vehicular assault and child abandonment taught us anything, it's that the holiday shopping season is a dark, competitive time. Now search engines are getting into the cutthroat holiday spirit. In a new attack on Google, Microsoft's Bing search engine accuses its rival's Google Shopping tool of being dishonest by only including paying vendors, ranking listings by how much they pay, and not clearly marking the results as sponsored. To make its point, Bing has launched a detailed site accusing Google Search of unsavory business practices and coined a new word: Scroogled.
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Google Shopping is the target of a nationwide attack ad from Microsoft's Bing search engine
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Google now only includes paying vendors in its search results
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Bing also includes paid vendors from third-party sites, but ranks paid and free listings equally
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Amazon, the biggest online shopping portal, no longer lists products on Google
"In the beginning, @placeholder preached, 'Don't be evil' -- but that changed on May 31, 2012.
On the main Google Shopping page, a disclaimer that @placeholder is "compensated by some" vendors is buried at the bottom of the page.