Notes from lecture on social media & summary of Chapters 2 & 3 from Christian Fuchs' "Social Media: A Critical Introduction". This includes discussion on what is social media, how it differs from other forms of digital media, the rise of Web 2.0, prosumers and participatory culture. It provides an in-depth overview Fuchs' argument on sociality in social media based on Durkheim, Marx and other social theories.