
Sunlight
improving the data transparency on the web
Sunlight launched on October 12, 2015 with 3 votes. The site was still online in September 2026, 11 years on.
What it does
Today’s Web services leverage users’ information – such as emails, search logs, or locations – and use them to target advertisements, prices, or products at users. Presently, users have little insight into how their data is used for such purposes. To enhance transparency, we are building a new set of tools system that detect what data – such as emails or searches – is used to target which ads in Gmail, which prices in Amazon, etc. The insight is to compare ads/prices witnessed by different accounts with similar, but not identical, subsets of the data. Sunlight is an analysis pipeline that provides causal targeting detection with statistical confidence, and at scale. In the paper, we propose…from systems.cs.columbia.edu
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