The new Home app/UX/quasi-OS is deeply integrated into the Android environment. It takes an effort to shut it down, because Home’s whole premise is to be always on and be the dashboard to your social world. It wants to be the start button for apps that are on your Android device, which in turn will give Facebook a deep insight on what is popular. And of course, it can build an app that mimics the functionality of that popular, fast-growing mobile app. I have seen it done before, both on other platforms and on Facebook.
But there is a bigger worry. The phone’s GPS can send constant information back to the Facebook servers, telling it your whereabouts at any time.
And most importantly it is Facebook, a company that is known to have played loose-and-easy with consumer privacy and data since its very inception, asking for forgiveness whenever we caught them with its hand in the cookie jar. I don’t think we can be that forgiving or reactive with Facebook on mobile.