Social Media or The Impact of Us

In this talk we explore the current impact of social media or social networks, commonly called Web 2.0, where content is generated by users in sites like Yahoo! Answers, Flickr, YouTube or Del.icio.us. This phenomenon puts forward new research challenges that involves not only computer science, but also economy and psychology, just to mention a couple of related fields. We call this emerging new science, community systems, and we mention some of the issues that we are studying, as well as further open problems.