I'm fairly certain that I know how magnets work, but I am intrigued as to how http://giphy.com/ managed to get animated gif's to work on Facebook. Does anyone have a clue as to how this is done? Is it mime-type substitution or some undocumented type? All the other methods that I've researched do not work.
Apparently they get around it by converting it to flash. Here's the Mashable article on it. So technically they aren't gifs by the time they get to Facebook.