When Facebook filed for its IPO in early 2012, the company cited the ongoing shift to mobile as one of the biggest risks to its future success. If the mobile shift was indeed the biggest challenge of Mark Zuckerberg's early career as CEO of a multi-billion dollar company, he has handled it admirably. Facebook not only generates the most of its revenue with mobile advertising, the company also owns some of the most popular apps in the world.

Earlier this week, Instagram announced that it now has over one billion monthly active users and thus becomes the fourth platform in Facebook's portfolio to reach this milestone. A look at some of Facebook's competitors highlights how difficult it is to achieve this level of adoption. With Twitter, Snapchat, and Pinterest all struggling to reach 500 million users, it's hard to imagine any of them reaching a billion. But with great power comes great responsibility (just ask Spiderman), and Facebook is currently doing its best to take responsibility for what happens on its namesake platform.

On Thursday, the company announced new measures to combat fake news and restore trust following recent scandals.