49% of Facebook's advertising revenues come from mobile

"Facebook, Inc. today reported financial results for the third quarter, which ended September 30, 2013.
"For nearly ten years, Facebook has been on a mission to connect the world," said Mark Zuckerberg, Facebook founder and CEO. "The strong results we achieved this quarter show that we're prepared for the next phase of our company, as we work to bring the next five billion people online and into the knowledge economy."
Third Quarter 2013 Operational Highlights
- Daily active users (DAUs) were 728 million on average for September 2013, an increase of 25% year-over-year.
- Monthly active users (MAUs) were 1.19 billion as of September 30, 2013, an increase of 18% year-over-year.
- Mobile MAUs were 874 million as of September 30, 2013, an increase of 45% year-over-year. Mobile DAUs were 507 million on average for September 2013.
Third Quarter 2013 Financial Highlights
Revenue – Revenue for the third quarter of 2013 totaled $2.02 billion, an increase of 60%, compared with $1.26 billion in the third quarter of 2012.
- Revenue from advertising was $1.80 billion, a 66% increase from the same quarter last year.
- Mobile advertising revenue represented approximately 49% of advertising revenue for the third quarter of 2013.
- Payments and other fees revenue was $218 million for the third quarter of 2013"
Source:  Facebook's Q3 earnings statement, 30th October 2013
Earlier -
41% in Q2
30% in Q1