Just to illustrate, here is a video written by international best selling author and keynote speaker Erik Qualman (@equalman). It's part of a series of social media videos that are the most watched in the world. You'll be amazed with some of the stats. Enjoy!
About Erik Qualman
Erik Qualman is an American author of Socialnomics, Digital Leader and Crisis. He is also an international keynote speaker speaking on Gen Y motivation, digital leadership, digital media and future trends.Wikipedia