I think the facebook pages are the weirdest anomalies. The video even shows users on those certain pages asking why they were created before the the actual shooting....
But in the end, it doesn't matter. All this talk of fake and conspiracy doesn't change the fact that we, as American civilians, don't have access to the 100% factual information. The government will hide stuff from us, and until it DIRECTLY affects me, I really don't care that much.
Great find OP, but you are only stressing and worrying yourself.