Youtube is good for a I CAN SEE IT WITH MY OWN EYES source. If Donald Trump gives a speech and it's on Youtube does that mean it didn't happen? Did you see that word "allegedly" in Wikipedia's description of OPERATION MOCKINGBIRD? Why would they use that when it really did happen?
Operation Mockingbird, CIA Media Control Program - YouTube
Operation Mockingbird: CIA Control of Mainstream Media - The Full Story - YouTube
Check out Dr Steven Greer's "Unacknowledged".
The movie is an Expose of the world's greatest secret that we are not alone, we never were! The Deep Security State, the Secret Space
Program, UFOlogy, Disinformation Programs, ET Contact, and Ancient Alien Theory.
"Unacknowledged" 2017 Official Trailer - Dr Steven Greer's expose of the world's greatest secret! - YouTube