Barcelona is reporting that the reigning Spanish champion has become something of a global phenomenon on social networks. According to the Catalan giant’s official Web site, Barcelona has one of the 30 most popular Facebook fan pages in the world. It is also the No. 1 sports club on the social media giant with 50 million fans, ahead of rival Real Madrid with 47 million, Manchester United with 38.5 million and Chelsea with 21 million. Barca also leads all sports clubs on Twitter, Instagram, Google+, Tencent’s Weibo and YouTube.