@Lexi Since Facebook doesn't support animated GIFs currently that's the only way sharing to Facebook is possible. (Uploading to giffer.co and sharing the link.)

@Taber: wouldn't this significantly increase your bandwidth costs though? Because to get this done these users would be linking to the gifs hosted on giffer.co instead of uploading to Facebook's servers.

@Lexi Lian Correcto! It's totally possible to do something like that, but it would only work for desktop users since it would require Flash, which is kind of a bummer. But if there's enough interest I'm all for it! :)

That's a Facebook issue. Facebook doesn't allow gifs to animate, unless it's a video (then it's not a gif anymore) and your viewers have autoplay turned on. That's how giphy's gifs "play" on Facebook feeds.