Regardless of whether they believed he was the real deal or not, I might suggest that using a social media website to communicate classified information would make one too stupid to be in a position of responsibility. The British military is already top-heavy with senior brass. A great excuse to pension off a few superfluous colonels, brigadiers and generals I think...
Stupid people in high places. But the use of social media makes such mistakes common.
The head of Mossad told all his agents not to have Facebook (after the Dubai assasination fiasco) but there was great resistance, because all the young agents are really into it.
The picture is actually from his OKCupid profile.
If someone wanted to weed through my 30,000+ posts here, do a bunch of homework and a little PI work, they could lock down exactly who I am, where I live, etc., but they'd have to work for it a little.
Still, I don't 'Facebook'.
If Government becomes more invasive and pervasive, it will not be long before the general public will fear their own statements in the social media, and they will be used to screen for reeducation candidates.