By Daniel hunter

Google’s ad revenue has helped it report profits of $3.38bn (£2.05bn) for the final quarter of 2013, an increase of 17%.

But Google were unable to see strong revenue in mobile advertising. The search engine giant maintains its spot as the biggest digital advertiser in the world, but were unable to match Facebook’s mobile ad growth.

Yesterday (Thursday), Facebook reported a 63% surge in revenue, largely thanks to a 76% increase in advertising revenue, with more than half coming from mobile advertising. Just two years ago, Facebook generated no revenue from mobile ads.

So far, Google has struggled to keep up with Facebook as advertisers seem unwilling to pay extra for mobile ads.

Google increased the number of paid-clicks by 31%, but the average cost-per-click fell by 11% in the fourth quarter.

The profits were barely dented by an increase in its losses from Motorola. It lost $384m in 2013, compared to $152m in 2012.

Yesterday, Google sold Motorola to Chinese computer giant, Lenovo in a surprise $2.91bn deal.

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