This report on Whisper by Dominic Rushe and Paul Lewis of The Guardian seems to have Neetzan Zimmerman of Whisper (@neetzan) in a fury, as Sam Biddle notes on Kinja.
UPDATE: Alyson Shontell reports Whisper Just Wrote A 5-Page Response To A Scathing Security Report: ‘We Do Not Track Or Follow Our Users’.
An iOS forensics expert takes a preliminary quick look at it:
http://www.zdziarski.com/blog/?p=4056
“… the Whisper app does not appear to be a social networking application with analytics; it appears to be an analytics and user acquisition application that also happens to have a social networking component.”
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Note: the website above won’t load if you block java and other things.