CyberReality is a frequent oculus employee who speaks to developers. What you are seeing is a series of posts on the developer board about trouble shooting a GearVR problem. CyberReality mentions to make sure that facebook "isn't blocked." The GearVR troubleshooting guide you get mentions unblocking certain applications if you are having trouble, but never mentions any sort of facebook app by name. This is the first time it has been explicitly mentioned.
Several people are dinking around ATM trying to figure out precisely what "block facebook" means and why you would need facebook to be unblocked to use a local application on your GearVR.