You're right. My guess is most "anonymized" data is lazy--stripping out obvious identifying information. There are quite a few cases where you can pinpoint us

You're right. My guess is most "anonymized" data is lazy--stripping out obvious identifying information. There are quite a few cases where you can pinpoint users from correlating to publicly available data. CGPGrey posted a video today showing a layman's example with Social Security Numbers[1]. One cool thing I heard Apple talk about[2] was injecting noise or subsampling to help mask individuals. Although, I don't see that mentioned in their public page on privacy[3] or their whitepaper[4]. [1] https://youtu.be/Erp8IAUouus https://youtu.be/Erp8IAUouus [2] https://www.wired.com/2016/06/apples-differential-privacy-collecting-data/ https://www.wired.com/2016/06/apples-differential-privacy-co... [3] http://www.apple.com/privacy/approach-to-privacy/ http://www.apple.com/privacy/approach-to-privacy/ [4] http://images.apple.com/business/docs/iOS_Security_Guide.pdf http://images.apple.com/business/docs/iOS_Security_Guide.pdf