Niconico (ニコニコ, "Smile"), formerly known as Nico Nico Douga (ニコニコ動画, "Smiley Video"), is a Japanese social media website that involves posting and sharing videos. It is also known as NCNC for a short term.
This website, and 2channel, are the birthplaces of the Gachimuchi fandom, ever since some users used homosexual wrestling videos to troll users (similar to Rickrolling in 4chan), and when some other users decided to make musical remixes of said videos usually based on mishearings. Tags such as "Wrestling Series" (レスリングシリーズ), "Philosophy" (哲学, Tetsugaku), and "Forest Fairy" (森の妖精, Mori no Yousei) were used for such videos.
In some videos, its headquarters buildings at Harajuku and Ikebukuro (former and current, respectively) were destroyed by the characters, accompanied with the comment "Yattaze" (やったぜ, "I did it").
Nico Nico Douga also hosts its own conventions for fans, which Billy Herrington sometimes visited with great applause.