Harry Potter-focused sites attract millions of fans every day - in fact, some online fans have become stars in their own right. Emerson Spartz was just 12 when he set up www.mugglenet.com. Today the site is visited up to 40 million times a month, making it one of the biggest Potter sites in the world.
"I spent the entire summer on the road signing thousands of autographs, which is simply unheard of for a geeky kid who created a Web site," he told Mike Collett-White of Reuters by telephone from the United States, where he is a university student.
"Harry Potter has got to a point where it is so popular that even fans have fans," the 20-year-old added.
"Pottermania" has never been more intense ahead of the publication today of Harry Potter and the Deathly Hallows, the seventh and final installment of a series that has already sold 325 million copies worldwide.