Futaba Channel is a Japanese imageboard website originally born as a mirror backup for the textboard website 2ch (now 5ch). You may be aware of 4chan, which was directly based on Futaba and from which it took much of its culture.

Nico Nico Douga is a video hosting website that was created soon after YouTube's boom. It's famous for having user comments scrolling across videos and for being one of Japan's biggest meme factory from 2007 to 2012. Forcing users to login to watch videos, the push for premium accounts, and a rough transition from FLASH to HTML5 are considered some of main reasons of its decline.