This is an affirming and encouraging gesture.
We should all practice it..
Thumbs up givers encourage my jokes, my observations, my attempts at wisdom, and my streams of consciousness.
He (or maybe SHE) does not know what I am talking about - But it does not matter.
You need a "THUMBS-UP-GIVER" in your life, even if you have to draw one and animate it. It can be an inner voice.
The shortest and surest way to find such a person is to be such a person.
Thumbs up giving is contagious and attracts like-minded people to your circle of encouragement.
Listen to this song and keep on keeping on!