"We often seek patents for technology we never implement, and patents should not be taken as an indication of future plans,” said a Facebook spokesperson.
However, the document raises yet more concern about a company that, in 2014, was found to have secretly manipulated hundreds of thousands of users’ News Feeds as part of an experiment to work out whether it could affect people’s emotions.
The new notification, which was announced earlier this week, is not an indication that Facebook itself has been hacked.
Instead it is triggered by malware on the users' computer or smartphone that is being used to try and access your Facebook account.
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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.
I am always looking for unique historical fiction novels, whether it be the era, location or characters etc.
Then I happened to stumble across Lucy’s novels via Twitter, which ticks all the boxes for me.
It’s the first thing potential dates see, and as this humorous article indicates, it makes a big impression (sometimes unintentionally).