comScore released its February 2010 U.S. Search Engine Rankings yesterday, announcing that 14.5 billion core searches were conducted, with Google Sites taking 65% of the search market.

The comScore press release listed Yahoo! Sites next, taking 16.8% of the search market, followed by Microsoft Sites (11.5 percent), Ask Network (3.7 percent) and AOL LLC (2.5%).

While the numbers are encouraging to the affiliate marketing industry, they are down 5% from January 2010 figures. On the plus side, Facebook.com showed a whopping 10% increase to 436 million searches, and Craigslist jumped to fifth position with 629 million searches.

We found this drop a bit surprising, considering that February includes Valentine’s Day, which usually makes for a busy search season. Plus, the Olympics were taking place, which often has sports enthusiasts searching for athletes and results.

On the other hand, February is a shorter month, and I’m wondering if, since it seems fewer people searched for Valentine’s gifts, perhaps there were a few more Americans slumped in front of their TVs during the Olympic Games—with broken hearts.

Now, who can search with a broken heart?