An investigation by the media organization The Markup found the pixel by Facebook and Instagram-parent Meta on dozens of popular websites targeting kids from kindergarten to college, including sites that students are all but required to use if they want to participate in school activities or apply to college.

On some level, that’s not a surprise: tracking tools like the pixel are so widespread that intensive tracking is almost the status quo. You could make the argument that these educational sites are “just the same as any other site,” said Marshini Chetty, associate professor of computer science at the University of Chicago.

But dealing with kids raises bigger questions about tracking on the web. “Why is there the Meta Pixel? Why are there session recorders?” she said. “What is the place of that on these sites?”