Twenty years ago today, "Harry Potter and the Philosopher’s Stone" (or "Sorcerer’s Stone" for U.S. readers) was released, and this most important anniversary is not going unnoticed by Facebook. 

As reported by Entertainment Weekly, the social media site is delivering a few magical surprises for users of its mobile app only. Type out one of the names of the four Hogwarts houses — Gryffindor, Slytherin, Ravenclaw and Hufflepuff, of course [Body Text]--> — and these words will take on the color of their respective house. The same goes for "Harry Potter" characters. Harry’s name, for instance, shows up red.

Cool, huh?