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If you aren't already in the habit of skimming through your Facebook News Feed on your smartphone, you're late to the party. Facebook says more than eight of every 10 people who use its service now do so on a mobile device. As part of its quarterly earnings report released Wednesday, the social media giant said it had 1.39 billion monthly active users as of Dec. 31, and 1.19 billion of them were mobile users (though some also checked Facebook on traditional computers as well as their smartphones and tablets). Of the 890 million people who used Facebook daily, nearly 84 percent did so on a mobile device.

Mobile ads accounted for 69 percent of advertising revenue in the fourth quarter. Many investors are betting that video ads, which Facebook began offering last year, will provide the company's next leg of growth. In a post-earnings interview with CNBC, Facebook Chief Operating Officer Sheryl Sandberg said the company now has 3 billion video views on Facebook per day, a huge increase from 1 billion in September. "From the advertising side, that give us an opportunity to do more monetization because our ad products always follow our consumer products. When consumers do more video we have the ability to do more video ads," Sandberg said.



— Reuters, CNBC and