Social Media Marketing

As I mentioned by myself, social media is getting more and more important for me and also for nearly everybody around me. Especially in the U.S., social media seems to be a very important and current topic. While using social media, I get more and more in contact with companies sharing their content or information about their products, what awakes my attention. Now I want to know more about the background why companies use social media, how they use it and further with which goals or intention they do it. I want to know how companies’ use of social media influences me and others and why it is working.