Patents don't always make it through to the end product- so it's not clear whether Facebook will bring out this new feature.Researchers at CBI Insights warned that the plans could put a lot of people off using the service.To generate hidden emoticons, you just have to know and type the corresponding keyboard shortcuts in the brakets.Go to Tools Privacy Settings and find the button Clear history.Its most recent emotional patent - which was granted on 25 May this year - aims to tackle a dilemma many of us will have faced.It can be difficult to make your text messages come across exactly as you mean them to, and sarcasm or jokes are often lost in translation - leading to some awkward conversations.
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Patent documents contain illustrations showing a person holding a smartphone with a camera taking a picture from which "emotion characteristics" like smiling or frowning are detected.
If the person appears to like what they're seeing, Facebook could place more of the same type of content in front of them.
Facebook will accordingly change the text font and size, before shaping to make it more emotive and relevant to your mood.
Facebook said that it does not currently offer tools to detect emotion.