Considering how universal laughter is and how much of it we do, there is, relatively, not a lot of research on laughter. One of the main researchers is Robert Provine from University of Maryland. Here is a summary of some of the research he has done…

https://www.blog.theteamw.com/2009/11/26/100-things-you-should-know-about-people-15-social-media-isnt-social-if-there-isnt-laughter/