The first thing to keep in mind is that the feature works with GIF links, not GIF uploads. At least for now, attempting to upload your favorite GIF will not result in a usable, playable GIF on Facebook.
Services such as Giphy, Imgur, GFYcat and others are trying to make it ...
Facebook allows posting animated gifs but stops them from actually being animated programmatically. There are a few apps out there that claim to let you animate your profile, but anyone visiting would need to have that app installed as well to see it.
you can't upload swfs to Facebook, and videos won't autoplay.
I do have to admit, you gave a lot of ...
It's because those GIFs are MP4s coded with high levels (6.0 etc.) that normal hardware can't play.
Disable "Hardware-accelerated video" decode in
(type this is address bar)
Keep "normal" hardware acceleration on!
Chrome > Settings > Advanced > System > Use hardware acceleration when
Facebook doesn't support neither animated GIFs nor video files. Moreover, no self-respecting web service with user-generated content will ever allow SWF files because they're not multimedia but rather executables (i.e. applications) and pose incredible security risk.
I researched and found that the image is generated by the application http://apps.facebook.com/animated-picture/
You can generate files like this from a SWF (flash) on this application as animated GIF and publish on your facebook!