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Pixiv is a Japanese-language community for artists. The site is popular enough with English-language fans that several tutorials have been posted online with instructions on how to join and use the site.  Pixiv staff eventually created an English interface option in 2011 after supporting Chinese.
The Pixiv Encyclopedia, also called Pixpedia, is a user-edited site that catalogues the many tags used on Pixiv, explains their meanings, and introduces representative works for every tag. The site describes itself as follows:
- pixpedia is Encyclopedia service for tags of pixiv. Explanations, related works, and related tags can be written in the article. Enjoy yourself and write attractive articles for those who is interested in pixiv.
Pixiv is an important hub for Japanese fan artists. For instance, many Doujinshi circles use their Pixiv pages as a "homepage" for the circle. As a company, Pixiv is involved in many fan-related events. It has an extremely popular booth at every Comiket.
Pixiv is a popular source of fanart posted on Tumblr. As this fanart is often not attributed, or is sometimes even altered without perimission, it has created considerable controversy. See Online Fanarts Protection.
Fail Fandom Anon discussed proper etiquette for Pixiv in 2013: The use of English tags is considered rude, feedback is usually PMed to the artist, bookmarks indicate popularity, and reproducing art is extremely taboo. 
In October 2022, Pixiv updated their policy about AI generated content and announced they released a number of new features to deal with it. They added tools so users could tag their works as "AI generated" and a separate ranking for them, they also added the option to filter out AI generated content.
Pixiv also has a marketplace-function called Pixiv Booth (begun in December 2013), that many artists use to sell products such as doujinshi, artbooks, keychains, buttons, etc. Officially, Pixiv has partnerships with a few right-holders to allow users to sell fanart and other non-original merchandise. Those official partners often share profit with sellers via additional transaction fees.
Pixiv operated an idol group called Niji no Conquistador under the leadership of Hiroaki Nagata, the CEO of Pixiv. In 2018, a former member of the group accused Nagata of sexual harassment. This prompted some users to remove their works from Pixiv in protest. Nagata resigned as CEO in 2018, and settled with paying her 1.1 million yen in damages in 2020.
A transgender employee accused a Pixiv executive of sexual harassment in workplace and sued Pixiv.. This prompted some users to remove their works from Pixiv in protest. Pixiv admitted their responsibility, settled with paying 5.5 million yen in damages, and announced anti-harassment policies.
- Some examples include How to Registration pixiv by Teruchan, Pixiv.net Registration Walkthrough, Introduction to Pixiv by swift, Tutorial: pixiv by tanomono (archive)
- Pixiv_en on Twitter
- Pixiv Encyclopedia in Japanese, Pixiv Encyclopedia in English
- Pixiv Encyclopedia help
- Pixiv later supported the translation of tags since 2018.
- Pixiv etiquette (Thread started 2013-03-05. Accessed April 6, 2013)
- https://www.pixiv.net/info.php?id=8729 We have released new features addressing AI-generated work. Accessed November 3, 2022
- Tweet from December 4 2013
- Examples: https://www.pixiv.net/en/artworks/68929227 https://www.pixiv.net/en/artworks/68990223