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# Webloc's Ad Network Quietly Tracks 500 Million Devices Worldwide
- URL: https://adjacent.media/signals/weblocs-ad-network-quietly-tracks-500-million-devices-worldwide/
- Published: 2026-04-12T11:00:55.000Z
- Updated: 2026-04-12T11:00:55.000Z
- Description: Citizen Lab exposed how a single ad-tech infrastructure—Webloc—monetizes location data from hundreds of millions of phones by selling access to real-time movement patterns. The ad ecosystem functions as a de facto surveillance layer operating without meaningful user consent or regulatory oversight.
- Author: Jonathan Greene
- Tags: #signal, theme-connected, cybersecurity, privacy

Source: [Citizenlab](https://citizenlab.ca/research/analysis-of-penlinks-ad-based-geolocation-surveillance-tech/?ref=adjacent.media)

Citizen Lab exposed how a single ad-tech infrastructure—Webloc—monetizes location data from hundreds of millions of phones by selling access to real-time movement patterns. The ad ecosystem functions as a de facto surveillance layer operating without meaningful user consent or regulatory oversight. This is not a data breach or a rogue actor. It is how mobile advertising works at scale, which means fixing it requires dismantling profitable business models rather than patching a security hole. Governments, corporations, and intelligence agencies now have cheaper, more continuous access to population movement than ever before.