Watching two billion people Michael Gross  Current Biology  Volume 28, Issue 9, Pages R527-R530 (May 2018) DOI: 10.1016/j.cub.2018.04.065 Copyright © 2018 Terms and Conditions

Face value: Big datasets collected via the online social network Facebook have become a valuable research tool for psychology and social science, but have also created risks of surveillance and manipulation. (Photo: Michael Gross.) Current Biology 2018 28, R527-R530DOI: (10.1016/j.cub.2018.04.065) Copyright © 2018 Terms and Conditions

Private lives: The mass exposure of private information in social networks has been described as ‘the end of privacy’. Importantly, privacy settings on websites protect personal information from fellow users, but not from the data accumulation conducted by the website itself. (Photo: Ken Banks/Flickr by a CC BY-ND 2.0 licence.) Current Biology 2018 28, R527-R530DOI: (10.1016/j.cub.2018.04.065) Copyright © 2018 Terms and Conditions

Mass movements: The sheer numbers of people engaged in social networks, by far exceeding those of citizens of any one country, have created new opportunities and risks. New ethical guidelines and regulations will be necessary for the responsible handling of the data acquired in their transactions. (Photo: Dimitry B/Flickr by a CC BY-ND 2.0 licence.) Current Biology 2018 28, R527-R530DOI: (10.1016/j.cub.2018.04.065) Copyright © 2018 Terms and Conditions