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Nico Nico Douga (ニコニコ動画, Niko Niko Dōga, lit. "Smiley Videos") is a popular video sharing website in Japan managed by Niwango, a subsidiary of Dwango. Its nickname is "Niconico" or "Nico-dō", where "nikoniko" is the Japanese ideophone for smiling.
Besides Piapro, Nico video is the primary source for Vocaloid Producers to showcase their finished works. As more songs were uploaded to the site, a rank system was created called the 週刊VOCALOIDランキング "Weekly Vocaloid Ranking", which is a ranking of most popular Vocaloid songs from the past week using statistics from Nico Nico Douga's metrics.
NND is most notable for scrolling marquee comments, which has become its trademark in video uploads.
Songs that become quite popular are often remixed, have videos created, or have a number of fans cover the song. In rare cases, some producers may achieve in getting signed with a record company. But more commonly producers release their works using a music service site or creating a CD. Nico video is also a place that brought together, and spawned, many doujin music groups, "Supercell" being a notable example of this.
Nico video continues to be just one of the most popular video sites for Japanese net users, winning awards and entertaining visitors.
As of 30 September 2012, there was 29.46 million registered Nico Nico users (5.77 million more than at 30 Sept. 2011; 16 million more than at 30 Sept. 2009). 67% of them are male, 33% female. Age distribution: 17.8% - <20, 42.5% - 20-29, 21.5% - 30-39, 12.1% - 40-49, 3.3% - 50 and older. 94% of Japanese aged 20-29 years are registered Nico Nico users. Nico Nico Douga has 111.16 million page visits per day, Nico Nico Live - 10.13. 
The Japanese version of NicoNicoDouga is available in Taiwanese, Chinese, Spanish and English GUI. All Nico Nico Douga accounts works across all sites. (ie. NND accounts will be recognized in NicoNico too.) An option to link a Facebook account to NicoNico is also available. Originally the English version was hosted differently, and linked to Dailymotion, YouTube and NND videos. However, comments for external videos are hosted locally, in the past NicoNicoDouga worked this way, but was changed when YouTube blocked external linking. The English NicoNico site seemed to be Niwango's attempt to spread the comment marquee culture into the west.
- Nico Nico Douga on Wikipedia
- Official Site: Nico Nico Douga (Global/Japanese, main)
- Official Site: Nico Nico (English, redirect)
- Wiki: Voca Wiki