Aldous, K. K., An, J. and Jansen, B. J. (2019) “View, Like, Comment, Post: Analyzing User Engagement by Topic at 4 Levels across 5 Social Media Platforms for 53 News Organizations”, Proceedings of the International AAAI Conference on Web and Social Media, 13(01), pp. 47-57. doi: 10.1609/icwsm.v13i01.3208.