[ How Whisper users can be identified ]( http://www.theguardian.com/commentisfree/2014/oct/17/whisper-private-secret-sharing-app-anonymity ) based on the vague geolocation data Whisper keeps.
Ссылка: https://stallman.org/archives/2014-jul-oct.html#19_October_2014_%28How_Whisper_users_can_be_identified%29