Exactly, it was already established that pictures from untrusted sources are to be disregarded unless they can be verified by trusted sources.

It is basically how it has been forever with the written press: Just like everyone now has the capability to manipulate a picture. Everyone can write we are being invaded by aliens, but whether we should believe it is another thing.

It might take some time for the general public to learn this, but it should be a focus area of general schooling within the area of source criticism.