http://www.forbes.com/sites/amitchowdhry/2015/06/01/facebook-starts-supporting-animated-gifs/

What’s good for your facebook profile I hope will soon be good for your fanpage. In this way you can have a rotating banner ad or movie short animation similar to those on websites and supported by a few “enlightened” mail clients appear in your facebook news stream.

For marketeers, his is a step in the right direction, albeit – a slow step.