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http://www.bbc.com/news/technology-42065650
Hundreds of web firms are tracking every single keystroke made by visitors, a study from Princeton University has suggested.
The researchers looked at seven firms that offer session replay software - FullStory, SessionCam, Clicktale, Smartlook, UserReplay, Hotjar and Yandex.
They found that 482 of the world's top 50,000 sites used scripts provided by one of these firms.
Firms using the software included the UK's news website the Telegraph, Samsung, Reuters, US retail giant Home Depot and CBS News.