The phrase "a picture is worth a thousand words" has been said in various ways throughout history. It may have originated as a Chinese saying, or with Napoleon, or the Russian writer Ivan Turgenev, or a 1920's trade journal writer called Fred Barnard; since we don't know its origins anymore, it's called a proverb.
Ironic, perhaps, that today we can hardly trust the origins or veracity of the many pictures we see. Manipulation is a more common practice than many realize, and it's getting harder and harder to spot. Below are links to notable altered photos past and present.
Some examples here
A more thorough investigation by Dartmouth here
(P.S. Is that Trotsky's ghost behind Katie Couric?)