(I didn't see any threads on other forums, so as not to be copying it or anything).
I find that the more "civilized" boards, or "pro" boards as some would call them, allow animated images to be uploaded to the forum, but they forbid the use of animated GIFs for avatars.
"Looser" boards, or hobbyists, appear to allow animated images as avatars. I've always allowed them, but do they get annoying? For some reason, I find animated signatures annoying, but not animated avatars.
Is it just me?