The new feature comes as Messenger moves deeper into its mission to morph from a mere messaging service into a platform on which other developers build their services. Facebook first signaled its intentions when the company cut off the ability for users to message in its core app over a year ago—forcing frustrated users to download the Facebook Messenger separately. And while its other efforts still feel like early adopter options, Uber is a mainstream service. To order a ride, users must have the latest version of Facebook Messenger installed on their phones.