Step 1. Upload or create your animated gif with Lunapic
Step 2. When your ready to share, just use the "FaceBook"
link below the picture.
Step 3. Lunapic will host your image with IMGUR
GIF image hosting, then give you the FaceBook
dialog to post on your wall.
Note that there may not be a preview of the
animation in that dialog, just post it!
(also Make your profile pic animated)