Is this a joke?

World's only all-around superpower, country which is spending more than 50 billion $ per year on various intelligence agencies and God knows how much more to maintain their huge network of spy satellites, uses anonymous posts on social medias like Youtube, Facebook and Twitter as top proof to accuse pro-Russian rebels for downing MH17? I was ashamed to watch this press conference, and I am not even an American...
https://www.youtube.com/watch?v=oQRvINebeok