I've seen this before looking for facebook and also skype - (Rome I think it was)... the desk agent apologized but said social media sites encouraged people to hog computers when others might be waiting for trip related use... ever been at the BA lounge in LGW North terminal? ... I haven't looked at content but the business area is a long way from staffed areas and is often full of kids using the PCs. The response will be a standard one for non access. They won't program a host of reasons for specific sites. Don't take it personally!