Google's net revenue in its core internet business increased more than 20 percent in the fourth quarter, after the world's No. 1 search engine introduced new product ads during the holiday shopping season.
Shares of Google were up roughly 4.5 percent at $US734.46 in after-hours trading.
The company posted consolidated revenue, which includes its Motorola Mobility mobile phone business but not the television set-top box business it recently agreed to sell, of $US14.42 billion.
Consolidated net income in the fourth quarter was $US2.89 billion or $US8.62 per share, compared to $US2.71 billion, or $US8.22 per share, in the year-ago period when Google had not yet acquired Motorola.
Excluding certain items, Google said it earned $10.65 per share in the fourth quarter.
Average cost-per-click, a critical metric that denotes the price advertisers pay Google, declined 6 percent from a year ago, the fifth consecutive quarter of decline.
Excluding traffic acquisition costs, Google's core internet business generated net revenue of $US9.83 billion in the fourth quarter, compared to $US8.13 billion in the fourth quarter of 2011.
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