Today more than a billion people use Facebook through mobile devices worldwide. And they spend 20% of time in mobile apps for Facebook services. Speaking during a conference call to discuss the acquisition of augmented reality company Oculus VR, Mark Zuckerberg, Facebook CEO, said: “We’ve made a lot of progress in mobile. As of last week, there are now more than one billion people actively using our mobile apps alone.” Zuckerberg also revealed that photo sharing app Instagram, which Facebook bought for $1 billion two years ago, now has more than 200 million active users.