“At Google, we are constantly trying to improve the techniques we use to protect our users’ security and #privacy. One such project, #RAPPOR (Randomized Aggregatable Privacy-Preserving Ordinal Response), provides a new state-of-the-art, privacy-preserving way to learn software statistics that we can use to better safeguard our users’ security, find bugs, and improve the overall user experience.”
▻https://research.googleblog.com/2014/10/learning-statistics-with-privacy-aided.html
You don’t need to trust Google for the implementation, but the idea is great and the full article extremely interesting: