Ossi Mokryn
Activemap: Visual analysis of temporal activity in social media sites
ActiveMap: Visual Analysis of Temporal Activity in Social Media Sites
ActiveMap shows user engagement over units-of-activity, giving both a global and a comparative personal view in a single snapshot. ActiveMap serves as a tool for visual anomaly detection

Left panel: ActiveMap uses Treemap; Right panel: Twitter ActiveMap with an overly active user.
Paper: Hagit Ben-Shoshan and Osnat Mokryn. 2018. ActiveMap: Visual Analysis of Temporal Activity in Social Media Sites. In Proceedings of the 23rd International Conference on Intelligent User Interfaces Companion (IUI '18 Companion). Association for Computing Machinery, New York, NY, USA, Article 49, 1–2. (Link)
Amazon users’ Book reviews measured in the number of days and number of daily contributions during days of activity for 2009 (left) and 2013 (right). A few users with the mammoth number of highly active days contributed in 2009:
