The Open Thread posted at the beginning of the month has gotten really, really big, so I've gone ahead and made another one. Post your new discussions here!
This thread is for the discussion of Less Wrong topics that have not appeared in recent posts. If a discussion gets unwieldy, celebrate by turning it into a top-level post.
I saw somewhere an article, though I unfortunately forget where exactly, about research noting that humor is also tied to social status. Jokes are funnier when told by a superior than someone below your own position.
As a personal observation, jokes are also more fun when there are lots of others who also laugh at them. They're also a great way to break the tension in a group situation. Humor has a very important social function, though obviously it might also have a function like the one you're describing, as "it's a social glue" doesn't explain why some things are funny and why others aren't. (Though I do think the social function is much greater.)