I mean, the Internet really seemed to take off when people realized they could get free porn, to be honest.
I'm betting the adoption curve for AI hits when the first company sells photorealistic porn of anyone you have a picture of. Hell, half ass Photoshop porn is lucrative already.
Charlie Bit Me is of the YouTube generation, so it wasn't passed around as an avi email attachment like some older memes of the previous generation. From that long ago, Exploding Whale comes to mind.