My favourite bit above (1:05):
This is our new auto-flame feature and that automatically generates a randomly chosen insult that’ll appear as a reply to the comment you clicked on. The great thing about this is that if the user who posted the original comment writes back, auto-flame will automatically reply to their reply. So you can have all the enjoyment of repeatedly insulting a total stranger but without the need to keep checking your inbox. So we really think that’s a game changer.