Mobile accounts for 59% of Facebook's advertising revenue

"Social networking giant Facebook has reported profits of $642m (£383m) during the first quarter of 2014, beating analyst expectations.
The firm said that a surge in mobile advertising helped push revenues 72% higher, to $2.5bn in the January-to-March period.
Mobile now makes up 59% of advertising revenue, from 30% a year ago.
[...]
"Facebook's business is strong and growing, and this quarter was a great start to 2014," said founder and chief executive Mark Zuckerberg in a statement.
"We've made some long term bets on the future while staying focused on executing and improving our core products and business. We're in great position to continue making progress towards our mission."
Shares of Facebook rose as much as 4.3% in after-hours trading.
The firm said it reached 1.28 billion users during the period, with more than a billion of those accessing the site through a mobile device, such as a smartphone or tablet.
The company has taken steps to further grow its mobile business - which barely used to generate any advertising revenue a few years ago - by expanding its product offerings.
This includes launching the Facebook Messenger service and news application Paper."
Source:  BBC News, 23rd April 2014