Yes, you can use .GIFs in Facebook Ads. They are classified as and play in the same way as videos.
Ad Specs for .GIF files are the same as Video files:
Headline text: 90 characters (There is no Headline, link description, CTA button, or display URL with Video/.GIF ads on Facebook
Aspect Ratio: 16:9 or 1:1
Resolution: at least 720p
Length: :30 max recommended
File size: 2.3GB recommended
*.GIFs cannot contain more than 20% text.
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