Actually Facebook not allow to put or post GIF file on facebook,but now you can post image with GIF format to Facebook by using code.
This trick is really simple,Follow these instruction:
1.Visit this link: Click here
2.Find google custom search box on :http://pspkeren.blogspot.com
3.Type "Bank" on google custom search
4.Click "Bank link",activate GIF image on the "Bank link",wait about 15 minute....!
news update Animated GIF ON Facebook: 16 februari 2012.Look at my facebook wall:
For code & instructions,download:click here
UPDATE AGAIN:THIS TRICK HAS BEEN BLOCKED/FIX BY FACEBOOK TEAM ON 20 FEBRUARI 2012
please bookmark this page (ctrl+D) for my update,i always update trick post animated GIF in this page,thanks....!
UPDATE AGAIN 8 march 2012:i have new trick for animated gIF on Facebook
Look at again my facebook wall:
Look at again my facebook friend wall for FB timeline: