On June 10th, 15:00, I will give a lecture at the ACE Seminar at University College London, Department of Computer Science.

More details here.



I will talk about Oshrat’s thesis studies on longitudinal privacy management:

Not Even Past: Longitudinal Privacy in Online Social Networks


Online social networks (OSNs) make information accessible for unlimited periods of time and provide easy access to past information by arranging information in timelines or by providing sophisticated search mechanisms. Despite increased concerns over long term digital memory, there is little knowledge about retrospective privacy: the extent to which the age of the exposed information affects sharing preferences. In the talk, I will describe two studies, the first with 193 participants and the second with 272 participants, which investigated how information aging impacts the users’ sharing preferences on Facebook, the largest online social network. Our results quantify how willingness to share decreases with the aging of older posts, and show that older posts have lower relevancy to the user’s social network and are less representative of the user’s identity. We show that changes in the user’s social circles, the occurrence of significant life changes (such as graduating from college) and a user’s young age are correlated with a further decrease in the willingness to keep sharing past information. We discuss our findings by framing digital memory in privacy theories and suggest a vision for mechanisms that can help users manage longitudinal privacy.