It's pretty ironic but you miss the fact that the the ones in authority right now are indeed google, twitter, facebook etc. They are in control of the information you see and can curate what you call an "established opinion". Global leaders tweet don't carry any authority if you don't support their view, it is the perception of general opinion those tech companies create with their algorithm that creates this authority. Certainly, assigning CNN as the Washington Post as "fact checkers" is not a good start or stringent, it is simply touting an opinion which is not going to change anything because no Trump supporter takes the CNN seriously.