Facebook has reported a 34 per cent year-on-year increase in mobile Monthly Active Users (MAUs) in its Q1 results for the quarter ended March 31, 2014, with mobile MAUs crossing the 1bn threshold for the first time at 1.01bn, out of a total of 1.28bn MAUs. MAUs for the previous quarter were 1.23bn, of which 945m were mobile MAUs.

Mobile Daily Active Users (DAUs) were reported as 609m on average for the month of March, out of a total of 802m DAUs for the month. This compares with 556m mobile DAUs for December 2013, out of a total of 757m DAUs.

Revenue for the first quarter of 2014 totalled $2.5bn, a 72 per cent increase on the $1.46bn figure for the first quarter of 2013. Revenue from advertising was $2.27bn, an 82 per cent year-on-year increase. Mobile accounted for “approximately” 59 per cent of advertising revenue for the quarter, compared to approximately 30 per cent in the first quarter of 2013.

While year-on-year revenues are up, the figures are down slightly on the previous (holiday season) quarter. Q4 revenues totalled $2.59bn, of which $2.34bn came from advertising, 53 per cent of this from mobile. So while overall ad revenues are down quarter-on-quarter, mobile’s contribution to the pot is up.

The company also revealed that its chief financial officer, David Ebersman has decided to move on, and will be replaced on 1 June by David Wehner, who is Facebooks current vice president, corporate finance and business planning. Ebersman will work alongside Wehner for the first four months of his tenure, and leave the company at the end of September.

Commenting on the results, Facebook CEO Mark Zuckerberg said: “Facebooks business is strong and growing, and this quarter was a great start to 2014. Weve made some long term bets on the future while staying focused on executing and improving our core products and business. Were in great position to continue making progress towards our mission.”