I use Facebook and owned a DK1 and DK2, but did not get the CV1 or continue to the use my DK2 because of the Facebook integration.
I trust Facebook with the information I explicitly share with it, i.e., posting photos or comments on Facebook. I do not trust Facebook to have unfettered access to a microphone, camera, and activity just to be able to play a game. The Facebook integration was, well, integral, and not just an opt-in for enhancing social aspects. You can't use the headset to play local content without phoning home (short of using old drivers/OpenVR or something).
Of course maybe this still places me in a minority of users because I have the same reaction when a mobile app requests every permission possible, which seems to be the case with all apps now.