Support Fenerbahçe have developed a strong following since their foundation in 1907. They are one of the most popular clubs in Turkey, with about 35% of the fans supporting them, and the most popular in Istanbul and Ankara. They have a large fanbase throughout the country, in Northern Cyprus, Azerbaijan and in the Turkish diaspora. Since the rebuilding of the Şükrü Saracoğlu Stadium, Fenerbahçe's average attendances have been among the highest in Turkey. Fenerbahçe have several supporter organisations, including Genç Fenerbahçeliler (GFB), Kill For You (KFY), Antu/Fenerlist, EuroFeb (Fenerbahçe supporters in Europe), Group CK (Cefakâr Kanaryalar), 1907 ÜNİFEB, Vamos Bien, and SUADFEB. Many fanzines, blogs, podcasts, forums and fan websites have been dedicated to the club. Relationships with other clubs More recently, in November 2011 Fenerbahçe's Genç Fenerbahçeliler created a friendly relationship with Torcida Sandžak, the organized supporters of Serbian club Novi Pazar. During a Süper Lig match against İstanbul Büyükşehir Belediyespor at the Şükrü Saraçoğlu Stadium, the Genç Fenerbahçeliler and 1907 Gençlik stand deployed a giant banner reading "Kalbimiz Seninle Novi Pazar" ("Novi Pazar, Our Hearts Are With You") and later, in the game against Radnicki Kragujevac in the Serbian SuperLiga, Torcida Sandžak members deployed a giant banner reading "Sancak'ta atıyor, Fenerbahçe'nin kalbi" ("The heart of Fenerbahçe beats in Sandžak"). On 2 March 2012, Fenerbahçe's Genç Fenerbahçeliler and 1907 Gençlik members were invited to Novi Pazar for the match against Partizan in the Serbian SuperLiga. Thousands of Torcida Sandžak members welcomed Genç Fenerbahçeliler and 1907 Gençlik's 17 members. Rivalries "The big three" clubs of Istanbul, Beşiktaş, Galatasaray and Fenerbahçe, have a century-long history of rivalry. The Fenerbahçe–Galatasaray rivalry is the primary Istanbul derby and the most important rivalry in Turkish football; matches between the two teams are known as The Intercontinental Derby (). The rivalry started on 23 February 1934, when a friendly game between both clubs turned into a riot, forcing the match to be abandoned. The rivalry has led to violence among supporters on numerous occasions. Torches, smoke, flags, and giant posters are used to create visual grandeur and apply psychological pressure on visiting teams, which fans call "welcoming them to hell". Stadium Fenerbahçe play their home matches at the Şükrü Saracoğlu Stadium, their own traditional home ground in the Kadıköy district of Istanbul, since 1908. Most recently renovated between 1999 and 2006, its capacity is 50,509. The club's museum has been situated in the stadium since