What site is best at making a meme go viral? 4chan, Reddit, 9gag, Imgur, Facebook or what?

I've said anything or anyone can become a meme at any moment... President Warren G. Harding who was in office almost 100 years ago... A rock could become a meme...

Footage from years ago could become a meme and already have. RickRoll, Trololol Guy, Cozoo Kid, etc

Memes are what make the internet great!