Harry Potter fandom refers to the community of fans of the Harry Potter books and films who participate in entertainment activities that revolve around the series, such as reading and writing fan fiction, creating and soliciting fan art, engaging in role-playing games, socialising on Harry Potter-based forums, and more. The fandom interacts online as well as offline through activities such as fan conventions, participating in cosplay, tours of iconic landmarks relevant to the books and production of the films, and parties held for the midnight release of each book and film. By the fourth Harry Potter book, the legions of fans had grown so large that considerable security measures were taken to ensure that no book was purchased before the official release date. Harry Potter is considered one of the few four-quadrant, multi-generation spanning franchises that exist today, despite Rowling's original marketing of the books to tweens and teens. Pottermania Pottermania is an informal term first used around 1999 describing the craze Harry Potter fans have had over the series. Fans held midnight parties to celebrate the release of the final four books at bookstores which stayed open on the night leading into the date of the release. In 2005, Entertainment Weekly listed the midnight release of Harry Potter and the Goblet of Fire as one of "Entertainment's Top Moments" of the previous 25 years. Diehard fans of the series are called "Potterheads". Some even theme their weddings around Harry Potter. A Bridal Guide featured two real weddings soon before the release of the final film, which quickly spread through the fandom via Facebook, Twitter, and Tumblr. The craze over the series was referenced in Lauren Weisberger's 2003 novel The Devil Wears Prada as well as its 2006 film adaptation. In the story, the protagonist Andrea Sachs is ordered to retrieve two copies of the next instalment in the series for her boss's twins before they are published so that they can be privately flown to France, where the twins and their mother are on holiday. Some celebrity fans of Harry Potter include Lily Allen, Guillermo del Toro, Ariana Grande, Stephen King, Keira Knightley, Jennifer Lawrence, Evanna Lynch, Barack Obama, Simon Pegg, ASAP Rocky, Seth Rogen, and Matt Smith. Fan sites There are many fan web sites about Harry Potter on the Internet, the oldest ones dating to about 1997 or 1998. One of the most famous sites allows fans