Why can't I post a GIF on Facebook comment?

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Tags

1. #thankfully
2. #extension
3. #comments
4. #added
5. #without
6. #takeover
7. #chrome
8. #continues
9. #ability
10. #allows
11. #leave
12. #support
13. #posting
14. #exactly
15. #launched
16. #which
17. #while
18. #button
19. #natively
20. #facebook
21. #animated
22. #update
23. #leaving