Facebook at work: leading by example?

That excellent and generous source for all things relating to law, Pinsent Mason's Out-Law, tells us that according to a written answer given by employment minister Chris Grayling staff working for the Department for Work and Pensions in its JobCentre Plus offices (which might be what used to be called labour exchanges, or at any rate might be functionally equivalent to them) are given access to LinkedIn (surely essential for anyone involved in matching people with jobs, and I don't just mean matching themselves with jobs) and Twitter (less obviously useful) but not Facebook, which is barred. The minister did not say whether this was simply to stop them wasting time - but I would imagine that with the the economy the way it is, JobCentre Plus staff don't have much chance to waste time even if they wanted to.