Well, possibly. I can't prove that that's not the case :) All I can say is that I've always taken them in good faith, because they match up with the temperament of some of the people I know and like inside the company.

That's really the problem with the social media policy. On the one hand, it protects the company from the worst possible outcomes of letting untrained employees loose on social media - and given the size of the company and the diverse views held by its employees, I could imagine those outcomes being pretty dire! But on the other hand there's a chilling effect on positive impressions of the company.