During a call with investors today, Facebook CEO Mark Zuckerberg announced that the social network had reached over one billion mobile users. That’s up from only 945 million active users in the last quarter of last year, putting the total gain since then at about 55 million mobile users. The Facebook-owned photo app Instagram also announced a milestone today on its blog as it passed the 200 million user mark.

Facebook CEO Mark Zuckerberg revealed today that the company now has over 1 billion monthly active users on mobile devices. Zuckerberg cited the statistic during an investor call to discuss the just-announced acquisition of virtual reality firm Oculus VR. In the fourth quarter of 2013, Facebook had 945 million active mobile users out of a total of 1.23 billion users.