Harry Potter's 20th Anniversary: Facebook marks Magic with Harry via 6-2-4-4-2; check here

20 years ago , Harry Potter and the Philosopher's Stone was first published in the U.K. Mentioning the words “Harry Potter,' “Gryffindor,' “Ravenclaw,' “Hufflepuff,' or “Slytherin,' in a text post will cause the words to light up in their respective house colors (Harry and Gryffindor in red, Ravenclaw in blue, Hufflepuff in yellow, and Slytherin in green).