Great recap… To add to this rich list my 2 cents would go to Treem, J.W., Leonardi, P.M., 2012. Social Media Use in Organizations: Exploring the Affordances of Visibility, Editability, Persistence, and Association. Communication Yearbook 36, 143–189. , as it compares various Internet media.  Then an important article to follow the thread of social media as data-intensive infrastructures Gerlitz, C., Helmond, A., 2013. The Like economy: Social buttons and the data-intensive web. New Media & Society 15, 1348–1365. doi:10.1177/1461444812472322 If this is an interesting line, I have recently elaborated on a definition of (social media as) data-intensive infrastructures, in an article connecting user-generated data to questions of value and valuations.  Tempini, N., 2017. Till data do us part: Understanding data-based value creation in data-intensive infrastructures. Information and Organization 27, 191–210. doi:10.1016/j.infoandorg.2017.08.001 N Dr Niccolò Tempini Research Fellow, Data Science Egenis, Centre for the Study of the Life Sciences Department of Sociology, Philosophy and Anthropology University of Exeter n.tempini@exeter.ac.uk @tmpncl www.tempini.info www.datastudies.eu