Jonah Berger, Wharton marketing professor, feels EMOTION is one of the key drivers.
In his research, he explains that people are social beings and love to share their opinions, thoughts & recommendations in order to feel accepted. So when they come across something that’s funny, cute or awesome, they just have to share it!
Emotions are behind most viral and shareable video content, with the premise that videos involving cute animals or babies puts people into a feel-good mood. These types of video’s tug at people’s heartstrings and when someone feels strongly about something, good or bad, they will share it.
Take a look at this trending video: https://www.youtube.com/watch?v=QQNL83fhWJU