Facebook is considering secretly watching and recording users through their webcams and smartphone cameras, a newly discovered patent suggests.
The document explains how the company would use technology to see how your facial expressions change when you come across different types of content on the site. 
It would analyse those images to work out how you feel, and use the information to keep you on the site for longer.
If you smiled as you looked at pictures of one of your friends, for instance, Facebook’s algorithm would take note of that and display more pictures of that friend in your News Feed.
Another example included in the patent application explains that if you looked away from your screen when a video of a kitten played, Facebook would stop showing similar type of videos in your Feed.
In another case, the document says that if you happened to watch an advert for scotch, Facebook could choose to …
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