[This magazine is already on board with this social networking site - sign up for MMR ?s tweets on its website, www.mmrmagzine.com.] When used judiciously and skillfully, Twitter can expand your reach, keep you connected, and move product - though the latter can prove elusive. At their NAMM Yamaha Piano breakfast meeting, I met Jeff Hawley, whose title is ?director, customer experience group.? At that point, clicks on links within Twitter and offsite conversions and customer service case solutions became our key success measurements.?