To mark 20 years since J.K.Rowling had her first Harry Potter novel published, we have chosen some of the best tweets celebrating 20 years of magic. https://twitter.com/amyw_137/status/879120613423566848   Already 20 years that #JKRowling enchants us with #HarryPotter Thanks!! pic.twitter.com/jRGT3mMx72 — Marie Gourvellec (@MayGourvellec) June 25, 2017 Happy 20 years of Harry Potter, Thankyou for everything,…