Facebook brings Stickered for Messenger app to iOS
If you install the Stickered app, but don't have Messenger downloaded on your phone, you will receive a prompt telling you that you just might want to add Facebook Messenger on your device. And by the way, all of your Stickered pictures are kept on your camera roll just in case you want to share them with friends or family who do not use Facebook.
The Stickered for Messenger app is available for free from the App Store for iOS users, and from the Google Play Store for Android users.
source: StickeredforMessenger (iOS|Android) via MacRumors