Online ad revenue growth raised Google fourth-quarter profits, the company said Thursday, but they still fell short of analyst expectations. The search engine giant's fourth-quarter profit of $4.8 billion was still an increase over the $3.4 billion reported for the fourth quarter of 2013. "Google's full year revenue for 2014 was $66 billion, up 19 per cent year on year," Google chief financial officer Patrick Pichette said in a press release. Fourth quarter revenue was $18.1 billion "despite strong currency headwinds," Pichette said. The pace of growth for Google's advertising business, measured in paid clicks, slowed in the fourth quarter to 11 per cent, compared to 14 per cent in the same quarter in 2013.