If the world really will end this Friday as the Mayans predicted, two things will undoubtedly remain: cockroaches and rap beefs. Sometimes, it feels like half of our working day is spent checking, researching, updating and monitoring the hundreds of squabbles, both real and made-up, among our favorite millionaires. Some have led to great art (Kendrick Lamar's "The Jig Is Up (Dump'n)"), while others have just made us scratch our collective heads (J. Cole vs. Diggy Simmons?). Fuse looks back on a year filled with hip-hop beefs and looks forward to the first inevitable fight of 2013. Let's do this.