This article reviews the concepts, methods and methodology for studying social media and users. Taking Facebook Fan-pages as examples, the author tries a preliminary survey of the meaning construction and deconstruction between social media and their users, which is typically Web2.0-based, with user-generated contents (UGC). The issues concerned are: What are social media? What are social media users? How to grasp the theoretical presuppositions behind a research of social media and users? How to do text mining from the big data of social media? To what degree could a study of social media and users be deemed as reliable? What are its potential limitations?