Global surveillance corporation #Elsevier tracks what you do when you use their enhanced pdf reader. Where and when you click and what you view and send it back with the ID of your library. They sell this data to anyone.
Koen Hufkens added on the Bird Site that the same goes for the HTML view of Elsevier articles. https://twitter.com/koen_hufkens/status/1467150182668292096
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