How does information technology work in business when everything is pushed through social media.?

How does information technology work in business when everything is pushed through social media.? I am reading this and it does not make sense. What is the best way to  illustrate how the business applications of information systems can support a firm's business processes, managerial decision making, and strategies for competitive advantage?  What are some examples of several major types of information systems when dealing with  business organizations in todays world?