For the person who needs to know everythig their lover is thinking, and for their lovers, who either won't know about this or don't mind being self-conscious about every breath, mumble, sneeze, and unspoken thought.
As reported by Reuters on V-Day:
Users who speak by pointing their mobile phones at themselves for video conferences can see a "love meter" bar on the screen of their handset during a conversation.
They later receive an analysis of the conversation delivered through text message that breaks down the amount of affection, surprise, concentration and honesty of the other speaker.
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