There's no limit as dictated by the TOS as far as I know (somebody correct me if otherwise) but like I mentioned above it's forum etiquette and nonverbally agreed upon to keep GIFs and images to a minimum. I swear I wouldn't be too far off the mark if I said that 80% of the posts you've made in the thread have included gifs/images.
Again don't worry about it, just as a norm try to keep GIFs and images to a minimum compared to how many worded posts you make. That's it for me though, heading to bed. This game ended on a good note for me today, let's hope it doesn't get sour with any info that comes out tomorrow.