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The NYTimes has been doing a great series about the kind of fine-grained "anonymized" location data that is available for sale from data brokers, collected from apps with lax privacy permissions that millions of people have installed on their phones. 1/
Here is the most recent: https://www.nytimes.com/interactive/2019/12/19/opinion/location-tracking-cell-phone.html … This time they got their hands on an enormous dataset. We've known for a very long time that "de-identification" (i.e. removing names from data) is completely broken, but location data really drives this point home. 2/
If you know where someone lives and works, then its trivial to pick them out from a location dataset: they are the only person who spends nights in their house and days in their office. Once you have picked them out, you can follow them everywhere.... For example, 3/
The NYtimes followed folks to "detours to hotels and late-night visits to the homes of prominent people", and "traveling to and from roadside motels multiple times, for visits of only a few hours each time." Or, you can track president Trump: https://www.nytimes.com/interactive/2019/12/20/opinion/location-data-national-security.html … 4/
Its hard to imagine legitimate uses of individual-level data. Most commercial interests care about statistical information: e.g. a retailer might care about the demographics and interests of their customers, and a hedge fund might care about where people are spending money. 5/
And it -is- possible to provide this kind of statistical information with protections like differential privacy, which make the kind of invasive stalking carried out by the NYtimes impossible, while still being useful in most legitimate use-cases 6/
So this seems like a great place for privacy regulation: this is a case where current practice can clearly be abused, and yet we have technology available that can prevent this kind of abuse in ways that aren't entirely antithetical to commercial interests. 7/7
What can I do to protect my privacy better
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