Mobile has become Facebook's most important focus, the platform that it will use to sign up the site's next billion users. Since launching native iOS and Android apps, the company adopted a mobile-first approach both publicly and internally. The part of the company that was once a black eye is now the center of attention. Said Mike Vernal, Facebook's director of engineering. "For Facebook and specifically our developers, for the past year-plus we’ve just been focused on, ‘Ok, it’s just about mobile, how can we help mobile developers?'"