I Found Corporate Networks Hidden Behind Porn Sites — Same Tracker Fingerprints, Different Brands

When you scan one adult site with Blacklight, you get a privacy report. When you scan 167 of them, you start seeing patterns that weren't supposed to be visible. I've been running Blacklight — The Markup's open-source privacy auditing tool — against adult sites for about a month. The original goal was straightforward: document trackers, cookies, fingerprinting, and session recording across the industry. Build a dataset. Publish the findings. But somewhere around scan 120, I stopped looking at individual results and started looking at clusters. And that's when the corporate networks appeared. The Setup Blacklight checks for seven things: third-party trackers, third-party cookies, canvas fingerprinting, session recording, keystroke capture, Facebook Pixel, and Google Analytics remarketing. Each scan produces a consistent fingerprint — a combination of flags that's unique enough to compare across sites. When two sites run by the same company use the same ad network, the same tracker stack