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Content Type: Long Read
In June 2025, a team of researchers exposed how Meta and Yandex abused Android and browser-specific tools to track users outside of their application and collect associated data. The technique used to achieve this was truly innovative, and akin to malware behaviour. It exploited protocols to break the isolation between apps and browser, a fundamental security concept meant to protect users. This allowed these companies to tie the browsing history of individuals with their accounts on the…
Content Type: News & Analysis
In September 2019, PI published the report Your Mental Health for Sale. Our investigation looked into popular mental health websites and their data sharing practices.
Our findings suggest that, at the time of the research, most websites we looked at were using third party tracking for advertising purposes, sometimes relying on programmatic advertising technologies such as Real Time Bidding (RTB), sharing personal data with potentially thousands of actors. Some websites were also found sharing…
Content Type: Report
The changes discussed in this article are based on a second analysis performed in late November, 3 months after the original study Your Mental Health is for Sale and following the exact same methodology. All data collected can be found at the bottom of this page.
Change is possible
Back in September 2019 we published the report Your Mental Health is for Sale exposing how a majority of the top websites related to mental health in France, Germany and the UK share data for advertising purposes.…