Kevin Ashton, in Quartz :
The word "meme" comes from evolutionary biologist Richard Dawkins. Bits of information, memes, propagate from brain to brain through imitation, are subject to selection and can be regarded as living structures, he says, "not just metaphorically but technically," because new information changes our brains. They are often made deliberately-think catchphrases, slogans, melodies-and makers may try to propagate them as fast and far as possible, or make them go viral.
The article is aptly sub-titled "The Harlem Make".