An internet meme is something that spreads like wildfire on the web- seemingly for no explicable reason. A meme can be as sublime as one of the many intricate Downfall parodies or as ridiculous as a rickroll - both reached millions of people. Dr Susan Blackmore examines what drives us to create and share internet memes, questions their cultural significance and finds out why, if you want a successful meme, you should probably get yourself a cat.

Producer: Jessica Treen.

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