An imageboard or image board is a type of Internet forum which operates mostly via posting images. The first imageboards were created in Japan, and many English language imageboards today are centered on Japanese culture. They are based on the textboard concept.
Imageboards, similar to bulletin board systems, are used for discussions of a variety of topics. The primary focus of imageboards, however, is directed away from text posts, and is instead placed on picture posts. The two share many of the same structures, including separate forums for separate topics, as well as similar audiences. Imageboards are much more transitory with content—on some boards (especially highly trafficked ones), the thread deletion time can be as little as 10 minutes. The most popular English language imageboard, 4chan, tends to revolve around Japanese culture such as CG artwork or anime. In Japan, where imageboards are more common틀:Citation needed, topics vary widely, ranging from trains to current news.
Imageboards are also different from online galleries in that most of the works posted are not made by the poster, but instead are taken from other online sources: galleries, other imageboards, and edited pictures.
Most imageboards and 2channel-style discussion boards allow (and encourage) anonymous posting and use a system of tripcodes instead of registration. A tripcode is the hashed result of a password that allows one's identity to be recognized without storing any data about users. Entering a particular password will let one "sign" one's posts with the tripcode generated from that password, while trying to take another user's tripcode and compute their password from it (for instance, to make posts that appear to come from a particular person) is computationally difficult. For those who want a custom tripcode, however, there are custom tripcode generators available, such as Meriken's Tripcode Engine<ref>Meriken's Tripcode Engine</ref> and MTY_CL.<ref>MTY_CL</ref> In general, anonymity is considered to be one of the advantages of an imageboard, and some boards have from time to time removed the ability to post with a name altogether (known as "forced anonymous/anonymity").
There are two primary types of imageboard software packages in widespread use:틀:Citation needed linearly directed imageboards modeled closely after Futaba Channel (in which content is posted through hierarchical subsections of topical interest, usually denoted by a forward slash such as "/f" for female), and nonlinear imageboards modeled after Danbooru (usually indicated by the usage of controlled folksonomic vocabulary for topical tagging and search).
Futaba Channel clones
There are currently several Futaba-based imageboard software packages in widespread use:틀:Citation needed Futallaby, Wakaba, Kusaba X.
Futallaby is a PHP script based on the Futaba script from Futaba Channel. Although the Futallaby source is still freely available at 1chan,<ref>틀:Cite web</ref> it is no longer in development, and the download page recommends using Wakaba instead, stating that "Wakaba can do everything Futallaby does and so much more." Futallaby started as a translation of Futaba, later retooled to support XHTML and customizable CSS styles. It is mostly notable for being the first open source English imageboard script.틀:Citation needed
Wakaba is a Perl imageboard script with a SQL backend to store thread information.<ref>틀:Cite web</ref> It is designed to be more efficient and cleanly written than other scripts that are available, while preserving the same kind of functionality. Wakaba is one of the most popular western imageboard software scripts,틀:Citation needed used most notably by iichan (Wakachan).<ref>틀:Cite web</ref> Because of its focus on bare-bones functionality, Wakaba lacks many of the modern amenities provided by 4chan's Yotsuba,<ref>틀:Cite web</ref> and newer imageboard scripts. A few users have attempted to remedy this by forking the original project and adding in features they consider beneficial. Two FOSS examples of this are frankusr's Wakaba fork,<ref>틀:Cite web</ref> and the user experience focused Glaukaba.<ref>틀:Cite web</ref>
Kusaba X is a continuation of Kusaba. Like Kusaba, Kusaba X is written in PHP, and is designed with modularity in mind. It requires a MySQL or SQLite database to run. Kusaba and its derivatives were at one time some of the most popular imageboard solutions.틀:Citation needed Kusaba X is still in development and the developers state that version 1.0.0 is to be released soon.틀:Citation needed
Usually referred to as a "booru" (or plural "boorus"). Unlike Futaba-inspired imageboard software packages, Danbooru and derivatives aim for a non-hierarchical semantic structure in which users are able to post content and add tags, annotations, translations, and comments.
There exists a number of different Danbooru-style imageboards, both those who have shared source code and those who are not released for others to use. The two main Danbooru derivatives are Gelbooru and MyImouto <!-- Some imageboard engines have a public API which can be used to automate publication and post viewing.<ref>틀:Cite web</ref><ref>틀:Cite web</ref> A de facto standard for the API, created by Danbooru and used by the other imageboards has been established for this. The feature is used by a number of board crawlers<ref>틀:Cite web</ref><ref>틀:Cite web</ref> and Firefox extensions.<ref>틀:Cite web</ref><ref>틀:Cite web</ref> -->
|틀:Yes||Danbooru||Ruby on Rails||틀:Free||Uses PostgreSQL.<ref>From Readme of the source code.</ref>|
|틀:Yes||CamelBoard||PHP||틀:Free틀:Citation needed||Does not use or require MySQL.|
|틀:Yes||naranai 1.3.x||PHP||틀:Free||Built to replace Danbooru because author considered Ruby unsuitable.<ref>From Readme of the source code.</ref>|
|틀:Yes||Moebooru||Ruby on Rails||틀:Free|
|틀:Yes||MyImouto||PHP and MySQL||틀:Free||PHP port of Moebooru. Uses a custom Ruby-on-Rails-like framework.<ref>From Readme of the source code.</ref>|
|틀:Yes||Sequenzia||PHP and MySQL||틀:Free||Modified and re-designed port of MyImouto for the Sequenzia Project.<ref>From Sequenzia Project Wiki page.</ref> Some code is specialised for the Sequenzia Project and AC Research.<ref>From Readme of the source.</ref>|
|틀:No||Gelbooru 0.2.x||PHP||틀:Proprietary||Gelbooru 0.1.x is open source but 0.2.x currently is not.|
|틀:No||Octabooru||PHP||틀:Proprietary||(temporarily down due to host server issues)|
|틀:No||booru-on-rails||Ruby on Rails||틀:Proprietary||"The 'booru-on-rails' project that powers Derpibooru is planned to be released to the public once the debugging is complete."|
틀:Main Futaba Channel (ふたば☆ちゃんねる), or "Futaba" for short, is a popular, anonymous BBS and imageboard system based in Japan. Its boards usually do not distinguish between not safe for work and clean content, but there is a strict barrier between two-dimensional (drawn) and three-dimensional (computer graphics (CG) and photographic) pictures that is heavily enforced and debated.<ref>2chan.net Futaba Channel</ref>
틀:Main 4chan is an English language imageboard based on the Japanese imageboard Futaba Channel. This imageboard is based primarily upon the posting of pictures (generally related to anime, manga, and popular culture) and their discussion. The Guardian describes it as "at once brilliant, ridiculous and alarming."<ref>틀:Cite news</ref>
The site and its userbase have received attention from the media for a number of reasons, including attacks against Hal Turner on his Internet shows,<ref>틀:Cite web</ref> distributed denial-of-service attacks against eBaum's World,<ref>틀:Cite web</ref><ref>틀:Cite web</ref> taking part in Project Chanology,<ref>틀:Cite news</ref> and multiple cases of anti-animal abuse reports.<ref>틀:Cite news</ref>
Many Internet memes have originated there, including lolcats,<ref>"Lolcats' demented captions create a new Web language", Tamara Ikenberg, The News Journal, 9 July 2007</ref><ref>틀:Cite web</ref><ref>틀:Cite web</ref> rickrolling and Pedobear.
틀:Main 8chan (or Infinitechan) is a primarily English language imageboard, though there are boards dedicated to other languages. Just like 4chan, 8chan is based on posting pictures and discussion anonymously, but unlike 4chan's anime focus, 8chan lets its users decide what they want to discuss by allowing any user to create their own board dedicated to any topic, a concept first made popular by news bulletin boards like Reddit. 8chan also claims to have a strong dedication to freedom of speech and allows all content—so long as the discussion and board creation abides by United States law.<ref>틀:Cite web</ref> However, local moderators enforce the rules of their own boards and may delete posts as they see fit. It is currently partnered with the Japanese textboard 2channel.
An English-language imageboard based on cannabis culture<ref name="420Anon">틀:Cite book</ref> which was created on April 4, 2005 by Kirtaner Aster. The name is a reference to the larger 4chan<ref>How imageboard culture shaped Gamergate</ref> and the code term 420 of the cannabis subculture. Its boards include various drug-specific boards,<ref name="420Anon" /> as well as a board featuring a chatterbot.<ref>틀:Cite web</ref>
Hispachan is an imageboard in spanish which was founded in late 2012. It is the successor of ñchan, another popular imageboard, which currently does not exist.
A primarily German-language imageboard that was founded in 2007.<ref>틀:Cite book</ref> The name is an allusion to the ethnophaulism Kraut for Germans. In 2009, after the Winnenden school shooting, the Interior Minister of Baden-Württemberg cited a post on the imageboard in a press conference that appeared to forewarn of the shooting, but was later found to be fake.<ref>틀:Cite web</ref><ref>틀:Cite book</ref><ref>틀:Cite web</ref> The site also features a popular English language board, /int/, which is also the origin of the Polandball internet phenomenon.
틀:Main Ylilauta is a Finnish-language imageboard that was founded in 2011 with the joining of the two most popular Finnish imageboards, Kotilauta and Lauta.net.
Wizardchan is an imageboard which discusses topics including anime, hobbies, and depression. Users often discuss suicide or self-harm, and a controversy emerged in the board's community about whether to refer users to suicide prevention hotlines.<ref name="slateWizards">틀:Cite web</ref>