The Cowboys
manchester united
Pittsburgh Steelers
Washington Redskins
AIK Solna, Hammarby, Djurgården, Malmö, IFK Göteborg
There are no offical fan clubs but there are thousands of sites to do with it out there. Some of the biggest can be found in related links.
Washington Redskins seems to have a large female fan base.
biggest college football fan base list
Justin bieber is a die hard eagles fan!!!!!
None of them have offical fan clubs
I'm not a fan of Dortmund myself, but yes they are a very good team, one of the best clubs in Europe actually.
I don't know, but the biggest fanbase on facebook has Germany