Booru

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A booru (plural boorus, Japanese for "board") is a style of imageboard much like a chan, except you have to register and the image you post stays up FOREVER. The result, of course, is inevitably large amounts of gay furry porn, gay furry fart porn, and CP. A booru can easily be distinguished by having a bunch of iddy biddy lolis holding up numbers on the front page bragging about how many images the site contains... DO NOT BE FOOLED! Behind every loli there are thousands upon thousands of obese lizard people gang-raping a fetus. And you're next. So, if you value your sanity, stay away... but, considering how you're you, that's a lost cause anyway...

Imageboard 2.0

Danbooru-style boards organize images based on tags, ratings, and scores. So instead of having a hierarchical organizing structure with a bunch of directories and sub-directories (or boards, such as /b/, /mlp/, /pol/, etc.) one finds images simply by searching for their characteristics.

Software

The software used on boorus varies but it is obvious that either ~~Derpibooru~~ (one has to have an account to affirm and negate multiple tags) or the Sankaku Channel has the best software. Booru.org's software is total shit. This is likely because Slayerduck is too poor to afford buying Gelbooru 0.2.x—so instead it's users are stuck with Gelbooru 0.1.x open-source-shitware. There is other software—which, qualitywise, is in between.

A list of boorus

rule #34 (rule34.paheal.net) – The Supreme King of boorus. Has rule 34-style porn of ~~EVERYTHING~~ loli is banned.
Danbooru (danbooru.donmai.us) – pretty much the same as Gelbooru, just a weeaboo overload.
Gelbooru (gelbooru.com) – pretty much the same as Danbooru, just a weeaboo overload. Also they bitch at you for tagging incorrectly instead of just aliasing tags.
Sankaku Channel (chan.sankakucomplex.com) – a more content liberal anime imageboard compared to Danbooru and Gelbooru—although racism is banned, even in jest. Also you only get to post 20 images then have to wait around 10 years to post more.
Derpibooru (derpiboo.ru or derpibooru.org) – Yes, even bronies have gotten their grubby little hands into this shit. They too are huge pussies as "racial, sexual or religious discrimination, use of racial or homophobic slurs, and other abusive content" is also banned (Rule #0).
PoniBooru (pbooru.com) – for MLP:FiM images that are not allowed at Derpibooru.
The Big ImageBoard (TBIB) (tbib.org) – so big, much wow.
Lolicon-centric boorus (see also Lolicon#On imageboorus):
- Lolibooru (lolibooru.moe)
- Dead: lolibooru.org
- Registration only: AllTheFallen (allthefallen.ninja) and Lolicit (lolicit.org). See Chaosscizzors.
Hosted on booru.org:
- Rule 34 (rule34.xxx) – a shitty knockoff of paheal.
- Realbooru (rb.booru.org) – IRL sexual images
- Safebooru (safebooru.org) – only non-porn crap for pussies.
- FurryBooru (furry.booru.org) – 2nd largest board—full of sick fucks.