If for nothing else EVERY airline CEO and all their staff (including the flight crew) needs to learn that somone is probably recording what you say/do and may post it where it can be uncomfortable. Best precaution is to assume that they are.
I know that the flight deck is meant to be your 'office' but it links to the outside world and the outside world sees no reason to be restricted. If does not matter that it's against the rules or against SOPs or against your view of life - it is the way things are in 2015.