This was very interesting, and explains A LOT of what happens on the internet. A theory, in any case.
Explains "The what colour is the dress" controversy (not the the colour; the controversy), gamergate, "All conservatives/liberals are ..." and cat pictures.
Have a cat picture;
(ETA; the video is starting at 7:26 for some reason, and editing doesn't seem to correct it, but you can slide it back to the beginning and start it over.)