There is no exact science to Twitter. Whether offering daily insights into your life or providing motivational messages to your 10,000+ following, tweeting is often a mixed bag. The rapper's we've chosen for this list have, in one way or another, tapped into something special. Be it Lil B's constant declarations of love, Jean Grae's hilarious observations, or Riff Raff's pseudo-intellectual silliness, these are the hip-hop heads who have actually mastered the micro-blogging platform. So what are you waiting for? Click 'Follow' already.