I have a hard time believing they selectively blocked Twitter and it wasn't just some connectivity issue. The Facebook post screencap implies it was an emergen

I have a hard time believing they selectively blocked Twitter and it wasn't just some connectivity issue. The Facebook post screencap implies it was an emergency landing due to a security issue. I guess the presumption behind this person not being able to access Twitter is that AA would block Twitter during a security related emergency to a) keep "terrorists" from coordinating a potential attack or b) keep passengers from leaking anything out. If that's the case, why would they block Twitter and leave Facebook wide open? Or any other services -- why wouldn't they just shut off the internet service altogether, because clearly terrorists and normal people also can use VPNs.