Analytics software that measures mouse movements or keystrokes has been around for years, says Steven Englehardt, one of the authors of the study. But the technology has typically been used to track groups of users, such as the parts of a web page where visitors linger the longest. The researchers found that FullStory and the other companies are now tracking users individually, sometimes by name.
Dig into the underlying research presented at https://freedom-to-tinker.com/tag/noboundaries/.