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Google Inc. and Facebook, in particular, have been outmaneuvering Yahoo in the chase for online advertising dollars.

Propelled by the Internet’s dominant search engine, Google’s revenue rose 26 percent in the fourth quarter to $8.4 billion _ surpassing Yahoo’s total of $6.3 billion for the entire year. Google is doing so well that it plans to hire more than 6,200 employees this year in what will be the biggest expansion in its 12-year history.

Facebook is privately held, but disclosed some of its results while raising $1.5 billion in a deal put together by Goldman Sachs Group Inc. Those figures indicated that Facebook’s 2010 revenue would more than double from $777 million in previous year.

Yahoo shares fell 50 cents, or 3.1 percent, to $15.52 in extended trading Tuesday after the results were released. In regular trading earlier, shares dipped 7 cent to $16.02.