A Deep Dive into Facebook and Datalogix: What’s Actually Getting Shared and How You Can Opt Out | Electronic Frontier Foundation

The intriguing way that an advertising metrics company matches up user events with datasets to create useful information.

“Using the information Facebook already has about its own users, Facebook then tests various email addresses and phone numbers against this dataset until it has a long list of the Datalogix ID numbers associated with different Facebook users. Facebook then creates groups of users based on their online activity. For example, all users who saw a particular advertisement might be Group A, and all users who didn’t see that ad might be Group B. Then Facebook will give Datalogix a list of the Datalogix ID numbers associated with everyone in Groups A and B and ask Datalogix specific questions – for example, how many people in each group bought Ocean Spray cranberry juice?”

A Deep Dive into Facebook and Datalogix: What’s Actually Getting Shared and How You Can Opt Out | Electronic Frontier Foundation

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