From time to time, the Facer team will release beta versions of the app before they are released worldwide in order to test new features. These beta versions may be a bit unstable, but can give you a chance to use new features before anybody else and contribute to the development of the platform.
To join the beta, you will need to opt in on Google Play at this url:
Once you are enrolled, you will start receiving beta updates for the app as they become available. You can opt out at any time by visiting the same url.