For my money, Twitter is the greatest invention since central air conditioning. One of the many reasons I love Twitter is that it allows nobodies like me to hear famous athletes and celebrities speak without a filter. This week Staff Sgt. Tim Kennedy (@TimKennedyMMA) initiated a war of Tweets with fellow MMA middleweight fighter Michael Bisping (@bisping). It started on Tuesday, when Kennedy launched this salvo in the direction of Bisping: [blackbirdpie url=”http://twitter.com/#!/TimKennedyMMA/status/70536816268288000″] First, the backstory. Kennedy’s friend Jorge Rivera (@Jorge_Conquista) fought Michael Bisping at UFC 127. Prior to the fight, Rivera and Ranger Up — an MMA apparel company run…