Niconico , known before 2012 as Nico Nico Douga , is a Japanese video-sharing service based in Tokyo, Japan. "Niconico" or "nikoniko" is the Japanese ideophone for smiling. As of 2021, Niconico is the 34th most-visited website in Japan, according to Alexa Internet.

Hiroyuki Nishimura is a Japanese internet entrepreneur best known for being the founder of the most accessed Japanese message board, 2channel, and current administrator of 4chan. He is also a self-help author and TV personality. He is often known by his given name, hiroyuki (ひろゆき), which he uses, rendered intentionally in lowercase, both as a pen name and as a username.