As Mark Zuckerberg stated in this post. Isn’t it really an outcome of facebook of its inability to port the facebook app world into the mobile. Facebook app concept(facebook apps and games) is been there right from it’s inception. but they really became slow in recognizing it’s ability to gather the crowd for any idea of social networking. Do you really think that Instagram, Whatsapp, Messenger (which ideas have already been implemented long before their inception as a facebook app in the facebook social world) would have developed and took their places as one of important cards in the present social structure ? never.
At-least now they recognized it (before me).