[nzach]

> enough samples that you can apply statistics to find precise locations, in many cases you can de-anonymize the IDs

I think a lot of people don't realize the power of a big enough sample size. With enough samples even something pretty innocent looking like your daily step counter could make you identifiable.

As far as I know we don't have large enough databases to make this happen in practice, but I don't think this is impossible in the future.

[jandrewrogers]

How large are you estimating is "large enough"?