At present, about three-quarters of Facebook's advertising revenue comes from mobile ads, as a lot of users access the social network on smartphones and other handheld devices.
Facebook has been coming out with its own stand-alone mobile apps to capture more of the time people spend on phones. Though, leaving aside Facebook's Messenger app, its home-grown efforts have had limited success.
Facebook has bought the popular photo-sharing app Instagram and the messaging service WhatsApp.
Yesterday, the company had introduced 'Hello', which is a voice-calling app designed for Android phones. In essence, it's meant for replacing the voice dialer on your phone.