"A tracking pixel is a small piece of code added to a website that sends information about the site's users to the platform that operates the pixel. That can include details of a user's activities, such as their browsing activity, purchases and searches. A website that embeds a pixel often does so to inform its advertising campaigns on the platform that create the pixel."
"When you look up a website in Blacklight, it will now report if it finds the TikTok pixel or X pixel. When its pixel is embedded across many websites, the platform can compile a user's data to build a detailed profile of their interests, behavior and other personal information. These profiles allow other businesses to buy ads from the platform to target categories of users - though this data can also be used for other purposes."
Since 2020 Blacklight has been used to run over 18 million website scans. The tool previously detected tracking pixels from Google and Meta and now also scans for TikTok and X pixels. Tracking pixels are small pieces of code that send user activity details—such as browsing, purchases and searches—to the operating platform, enabling compilation of detailed user profiles and targeted advertising. Blacklight reports when TikTok or X pixels are found and provides an option to download an archive with more detailed data about what is passed through pixels. New detection features were developed with Brandeis University computer science students.
Read at Themarkup
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