Facebook has allowed businesses to post GIFs in Page posts.
According to The Next Web, Wendy's, Coca-Cola's Brazilian brand Kuat and BuzzFeed are the first businesses with the ability to share GIFs. These will appear in regular page posts as well as 'Boosted' posts but not in sidebar ads.
The company says it is only testing GIF support at present and will evaluate how it affects the user experience before rolling out it to more Pages.