Facebook is coming out on top of digital advertising growth

What's more, Facebook says its three popular mobile apps -- Facebook, Messenger, and Instagram -- combine to represent an average 46 minutes of use per day, per mobile user. If accurate, that would represent nearly a quarter of all mobile use. That's likely why eMarketer expects Facebook to continue gobbling up share of the mobile ad market over the next few years, even as more companies make mobile their focus.
http://uk.businessinsider.com/facebook-is-coming-out-on-top-of-digital-advertising-growth-2015-12