The phenomenon of online diffusion of misattributed quotes is so widespread that got its own dedicated meme. You may have seen a picture of Abraham Lincoln, the 16th President of the United States, that warns: ‘Don’t believe everything you read on the Internet just because there’s a picture with a quote next to it’. Lincoln, apparently nicknamed ‘Honest Abe’ when young, was assassinated in 1865, which makes it unlikely he had opinions about the Internet, and he is one of the historical celebrities most quoted (often incorrectly) on the web. Lincoln shares this questionable honour with the likes of Mark Twain and Albert Einstein. ‘The definition of insanity is doing the same thing over and over again and expecting a different result’ is one of the most famous quotes of Albert Einstein. Except that is not: the earliest known exact match of the quote appears in a Narcotics Anonymous information pamphlet in 1981, some 25 years after Einstein’s death.