My theory on why they were successful is that they made it possible for "anyone" to quickly respond with a gif response. Responding that way had become "cool" b

My theory on why they were successful is that they made it possible for "anyone" to quickly respond with a gif response. Responding that way had become "cool" but it was difficult or impossible for people who didn't hoard a stash of gifs. This sort of solution "Make it easy for the rest of us" is a tried and true winner of traction for products.