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If someone really wanted to, couldn't they buy that anonymized data and then make a series of inferences on which data is yours based on cross-referencing various information? (please correct me if this is wrong)

Like say I run hackernews — couldn't I just cross-reference my own logs with that "anonymized" data and get a pretty good idea of what a specific users' traffic was?

Based on some of the tools Uber has used to pinpoint specific users like, government officials, it doesn't seem too far beyond the realm of possibility.

Exactly. Gather a could sources - as is already happening - and with a graph DB and not even grad level algorithms you could get a pretty accurate picture of enough people, given enough data.

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