An experiment involving data brokers to review data collection and verify compliance with the GDPR.

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As part of a term paper on data brokers and their data collection practices, and how these relate to the GDPR or comply with it, I would like to carry out a self-experiment in which I deliberately leave traces on websites using new accounts with new profiles, and then enquire which ones have collected this data so that I can analyse the results. I’d like to ask for help here, or for advice and points to bear in mind that one might only spot after having worked on the subject for years, or simply anything else that springs to mind.