The game's Facebook connection on Android is indeed not working properly at the moment. The problem manifests itself so that the game just stays on the "connecting" screen with the bouncing balloon, but nothing happens. If you're experiencing this problem, please don't delete and re-install the app. It won't fix the issue, and you'd end up losing your game progress since the Facebook connection is the only thing that saves the game progress to an online cloud.
We unfortunately don't yet know what's causing this, and our workarounds don't seem to help. However, our developers are working diligently to fix the issue as soon as possible.
We apologize for the inconvenience and thank you for your patience!