US web users conducted 9.6 billion searches at the core search engines during December 2007, representing a 3.9 per cent decline on November, according to market research firm comScore.
Search activity typically experiences a seasonal decline during December as many Americans spend time away from home during the holidays, the analyst said.
As ever, Google remained the top search property with a share of core searches standing at 58.4 per cent.
Yahoo experienced the most significant market share increase, gaining 0.5 points versus the previous month.
Google also leads search activity on a global basis, recording 7.2 billion searches in December alone.
Yahoo ranked second with 2.4 billion searches, followed by Microsoft (963 million), and Time Warner Network (784 million).
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