There are lots of inventions, it is up to you to decide either these inventions are useful or not. There is an invention called “Like a Hug jacket” which is invention of a Melissa Chow, from the Massachusetts Institute of Technology (MIT). Melissa Chow point of view is “It allows us to feel the warmth, encouragement, support, or love that we feel when we receive hugs”
Mechanism of this jacket is simple. Air pockets inside the jacket expand every time your smart phone send a signal to coat that a new “like” has been arrived. You can send back hug to your friend just by squeezing the jacket.
It’s designed to bring people closer together despite being physically far away from each other. But if you get too many likes, the coat could become a bit suffocating and would start annoying you fairly quickly.