Therese aren't so much contradictions as indicators the reasonable answer to the question posed is really a simple 'No'. The only sane way it becomes yes is 'Yes it's possible if Facebook rewrote a bunch of Facebook AND Amazon rewrote a bunch of AWS'. That kind of possible isn't very interesting, though. It's surely possible to host Facebook on AWS if Amazon built an exact replica of each FB data center, trucked FB's servers over and then called the result part of AWS.