Free hugs

The cult of free hugs was started by a guy who didn't want to be alone when arriving at an airport. So he made a sign saying free hugs and begged other people to hug him. "Free-hugging is a hippie activity that consists into hugging total strangers like if they were your best friend, giving them a big dose of fake love and forgetting about them subsequently." 

There are strong links with other sharing cults such as CouchSurfing.