By Reed Albergotti 

Facebook Inc. isn't signing up new users the way it once did, but the social network is generating a lot more revenue from each user.

Its fourth-quarter earnings grew 34%, to $701 million, propelled by a 49% increase in revenue, to $3.58 billion. Mobile advertising surged, helping Facebook narrow the gap with rival Google Inc.

The Menlo Park, Calif., company's spending limited profit growth for the second quarter in a row.

Total costs and expenses jumped 87%, to $2.7 billion. Research and development costs, which includes salaries for much of the staff absorbed through recent acquisitions, more than doubled, to $1.1 billion, from $408 million.

Operating margins fell to 29% from 44% a year earlier.

The 3% increase in daily active Facebook users last quarter was the lowest since 2012. The share of users who visit daily, which Facebook terms "engagement," remained flat at 64%, the first time that ratio didn't increase since the company went public more than two years ago.

Still, it is collecting more advertising revenue for each user. Globally, that figure rose 31%, to $2.81, compared with $2.14 in the same quarter a year earlier.

In the U.S. and Canada, Facebook's most-developed market, revenue grew even faster, to $9 a user, up from $6.03.

Most of Facebook's user growth is outside North America, where spending on advertising pales in comparison. In its Asia-Pacific region, average revenue was $1.27, and elsewhere it was 94 cents.

Facebook said 85% of its users now access the network via mobile devices, and more than a third access it exclusively via mobile. Advertisers are following: Facebook said 69% of its $3.6 billion in advertising revenue came on mobile devices, up from 53% of advertising revenue in the year-earlier period.

Market researcher eMarketer estimates that Facebook last year held 18.4% of the $40 billion mobile ad market, up from 16.6% in 2013. Google's share, by contrast, dipped to 40.5%, from 46.6%, eMarketer said.

Facebook is offering little advertising on its three other mobile-focused networks: WhatsApp, Instagram and Messenger.

"Facebook is a Goliath in mobile," said Rajeev Chand, head of research at Rutberg & Co., an investment bank focused on the mobile industry. Mr. Chand said Facebook increasingly competes with television for advertisers.

"What's more powerful?" he asked. "A 30-second slot in a TV program where everybody is DVRing past the ad, or...a Facebook news feed where it's shared or promoted and gets the attention of users?"

Across all digital advertising, eMarketer said Facebook's share rose to 7.8%, from 5.8%, while Google's fell to 31.1% from 31.6%.

Chief Operating Officer Sheryl Sandberg said Facebook still has plenty of room to grow its advertising revenue. "For any client, no matter how important they are to us, we represent a very tiny part of their ad spend," she said. "We want to drive their business."

In after-hours trading, Facebook shares fell 2.5%, after gaining 46 cents a share to $76.24 in 4 p.m. Nasdaq trading. Facebook reported its results after regular trading hours.

Facebook has been making a bigger push into online video, challenging Google for supremacy in the growing market. Chief Executive Mark Zuckerberg said it now averages more than three billion video views a day, up from around one billion a day last summer. Facebook said the majority of those views are on mobile.

Those numbers are no doubt affected by Facebook's decision last year to change videos in the news feed so that they playback automatically, initially without sound.

A video that plays for more than three seconds before a user scrolls past it counts as a view.

Video advertising could be a good source of revenue for Facebook, said Forrester Research analyst Nate Elliott, but the idea Facebook can take on Google's YouTube is "a crazy ambition," he added.

Mr. Elliott called Facebook more a medium for "micro video," or short clips and YouTube better for longer videos that lend themselves more to advertising.

"I don't know how you show a pre-roll ad in a six-second video," Mr. Elliott said.

Facebook said little about its successful app install ads business, which drives users to download mobile games and other apps.

Facebook doesn't break out revenue for app-install ads, but game developers complain that there aren't enough ad slots to satisfy the demand.

Craig Palli, chief strategy officer for Fiksu Inc. a mobile-advertising software company, said the Facebook Audience Network is beginning to solve that problem.

He said the ad network, which allows the app install ads to appear on apps other than Facebook, is quickly growing larger.

"What Facebook Audience Network has done is allowed Facebook to find larger amounts of inventory," for app install ads, he said. "Facebook does not have a demand problem to grow. They have a supply problem to grow," Mr. Palli said.

Write to Reed Albergotti at reed.albergotti@wsj.com

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