Schwartz interprets Google's move as a warning to sites engaging in a controversial practice: buying and selling links to game Google's search engine.

FORBES: Google Scares The Search Crowd

The final list included planned, strategic social media campaigns, like Bing's partnership with the Facebook game Farmville to lure players to the search engine with a Farmville money reward.

FORBES: Viral Marketing

There are as many web pages for advertisers as there are keywords that can be typed into a search engine, situations that game players might find themselves in, and so forth.

ECONOMIST: Internet advertising

The move raises the game for Microsoft, which competes with Google with its Bing search engine.

FORBES: Google Fasterer!

According to SeatGeek, an online event ticket search engine, the average ticket prices for the BCS National Championship Game have been on the decline in recent days, falling about 33% from where they were just 10 days ago.

FORBES: Big Dip In Notre Dame vs. Alabama Ticket Prices Demonstrates A Weak BCS Secondary Market