If you are still looking for a reason to join Twitter, then you’ve already missed the boat. With an estimated 5 million users (and growing), nearly $60 million in secured funding and interest from big-time corporate buyers, the microblogging platform has, at least for now, secured its role as lead actor on the social media stage. The companies with the sharpest foresight got on board ages ago, and they are currently reaping the benefits of what many are calling the world’s biggest cocktail party. For everyone else, the time to integrate Twitter into communications strategies was yesterday. So without further ado, here are some key best practices from those who have gone before you.