a twitter gif (at least the subset of them I'm referring to):
- is mostly of people going "hell naw" or "hell yea" or similar shit
- is often (but not always) a gif'd version of a STATIC meme image that's already used a lot (see: I don't often x)
- is used pretty much exclusively to reply to Tweets, never by itself
- and finally, could've just as easily been replaced with a "yes" or "no" reply