https://www.judiciary.senate.gov/imo/media/doc/Zuckerberg%20Responses%20to%20Judiciary%20Committee%20QFRs.pdf https://www.judiciary.senate.gov/imo/media/doc/Zuc

https://www.judiciary.senate.gov/imo/media/doc/Zuckerberg%20Responses%20to%20Judiciary%20Committee%20QFRs.pdf https://www.judiciary.senate.gov/imo/media/doc/Zuckerberg%20... Quick search indicates the tracking information starts on page 84. Page 86: "Device operations: information about operations and behaviors performed on the device, such as whether a window is foregrounded or backgrounded, or mouse movements (which can help distinguish humans from bots)."