Make stupid suggestion, get stupid answers.
Says a lot that you think that maybe inconveniencing some terrorists a little is worth the major inconvenience this would cause to the tens of millions who use these websites up and down the country daily.
Do you genuinely believe that there is a finite supply of websites in the world? What exactly do you think is going to stop people from starting a NEW one exactly? If you're going to post such half-baked drivel at least flesh it out a bit so it vagely resembles a plan, not just the mad ramblings...
Christ are you still going on? I'll humour you...
What exact aspects of FB/Twitter (I don't know why I'm even bothering to ask, since you clearly don't use either) exactly are you referring to that make these websites SO useful to 'Terrorists' that blocking them would make any impact what so...
Well act it then, you complete and utter fool. This is up there with BG's postings. Another prime example of someone who shouldn't be allowed out the house.