Why would I want to rub my friend's faces?

When I have a mii's attention (whether it's my friend's or my own), I can "rub" their face. When I do so, a bar with text appears at the top of the screen containing the text "They seem to like that!".
But what does that mean exactly? What's the benefit?
Best Answer
It doesn't mean anything, it's just supposed to be a "cute" interaction. There's no benefit.
Nintendo seems to like that sort of thing, as it appears in games like Tomodachi Life as well.
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Why does rubbing your face feel good?
Rubbing your face or pressing your eyes triggers the 'oculocardiac reflex', which lowers the heart rate. This can help you relax when you are tired or stressed.Rihanna - Rehab (Official Music Video) ft. Justin Timberlake
More answers regarding why would I want to rub my friend's faces?
Answer 2
It's just flair, there are no benefits for doing this.
Answer 3
Rubbing a face in Miitomo has no purpose, it is purely a visual effect to make the game feel more immersive.
Answer 4
Rubbing your Mii or your friends Mii gives you flowers. They only last a moment though, so don't go running to your gift box.
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