Facebook splits Messenger
One way to rile your users: Remove a popular feature from your app. This year, Facebook announced plans to drop its built-in chat and instead require users to download a separate application, Messenger, to retain chat capabilities.

The decision was wildly unpopular and wrought with misconceptions. Months later, after Messenger has clocked more than 500 million downloads, much of the moaning has subsided. In a recent Q&A session, Facebook CEO Mark Zuckerberg admitted that the social network could have handled the switch better.

"Asking everyone in our community to install a new app is a big ask," Zuckerberg said. "Asking folks to install another app is a short-term painful thing, but if we wanted to focus on service… we had to build a dedicated and focused experience. This is some of the hardest stuff we do, is making these choices. We realize that we have a lot to earn in terms of trust and proving that this standalone messenger experience will be really good."