I'd like to interject for a moment to give a fragmented and incomplete biased history of the fediverse.
Mastodon is just the name of a software that allows users to connect to a larger network commonly known as the fediverse. There are several other software that do the same thing Mastodon does.
The history of the fediverse is very convoluted and much of it is lost because of it's decentralized nature and lack of people interested in documentation. The first prominent software was Friendi.ca and GNUsocial in 2010. While Friendica tried to emulate facebook, GNUsocial attempted to emulate twitter.
The original state of the fediverse up until 2015 was mostly FOSS nerds, Spanish speakers and anarchists. The largest instances were run by the maintainer of GNUsocial, a leftist swede named Hannes. These were the
Quitter instances.
Sometime in late 2015, several new instances using the GNUsocial software popped up, populated by
gamergate people banned from twitter,
8channers,
shitposters and other weirdos. These instances came to be known informally as the GNUsocial Axis. There was a shitstorm on the Quitter side of the fediverse when they realized for the first time that in a decentralized system, they had no way of banning people they disagreed with. Eventually, the drama dissipated because the newcomers weren't anywhere near as bad as what quitter users feared and the political climate back then was more easygoing in general.
By October 2016, relations had cooled off between Quitter users and the Axis. Eugen Rochko AKA
Gargron, another swede created Mastodon that month. Mastodon was created because development on GNUsocial was almost nonexistent. Improvements in site usability made the fediverse a viable alternative to twitter for normies for the first time, and the Mastodon project attracted a lot of media attention from sites like tech sites like Ars Technica. Many users signed up on Eugen's flagship instance mastodon.social under the misconception that "Mastodon is Twitter without nazis". The new wave of SJWs began complaining about the content they saw and demanded more moderation without understanding the implications of blocking instances on the fediverse.
Early 2017,
mastodon.social started using
blocklists to prevent Axis instances from federating, meaning that no posts from a nazi instance were displayed to mastodon.social users. Eugen expressing contempt for GNUsocial users didn't help relations much. Many Mastodon admins used blocklists like their own personal block, even though it applied to everyone who used the instance. Instead of just blocking particular users, entire instances were labelled evil because of a single post.
Here is one of the silliest blocklists.
In April of 2017,
pawoo.net was created by Pixiv, the deviantart of Japan. One of the main reasons it was created was because Japanese artists were constantly being shadowbanned or restricted for posting things like lolicon. It became the largest instance on the fediverse within a week and several other large Japanese companies hosted mastodon instances. The sudden wave of japanese posts, lolicon and lewd anime girls enraged the users of mastodon.social much to the delight of the GNUsocial axis. Eugen blanket banned the largest instance on the fediverse from his instances to protect his hugbox.
In early 2018, a user from the GNUsocial Axis began work on a new software to replace the dying one written by anarchist swedes called
Pleroma. Pleroma was much faster and lightweight than both GNUsocial and Mastodon, and was adopted by some Axis instances. Because it wasn't bloated like Mastodon, it could run on any computer including a raspberry pi, making the ideal of decentralization actually possible by lowering the requirements for self-hosting (AKA hosting your own instance). Predictably, social justice instances on the Mastodon side immediately labelled the developers and users of the software as evil nazis. Several Mastodon users and admins advocated a complete defederation from any site using the Pleroma software.
It is worth noting that
not all Mastodon instances are hugboxes.
niu.moe has rules for it's own users, but does not prevent it's users from seeing Axis posts. Because of their neutrality, they've been blocked by some social justice instances.
noagendasocial.com is another mastodon instance that does not censor what it's users see.
As of now, Pleroma is catching up with Mastodon for feature parity much to Eugen's frustration. If you want a laugh, read this blocklist, which also by
pure coincidence happens to be an excellent directory of instances to sign up for if you value being able to speak without being censored.
http://telegra.ph/Instances-to-silencesuspend-on-Mastodon-06-23
My point is that there is more than just social justice Mastodon instances on the fediverse. It is a very diverse ecosystem of anarchists, furries, unix neckbeards, shitposters, anime girl RP, SJWs, free software fundamentalists, Japanese artists and
lolcows.
If you're talking about the network as a whole, the proper nomenclature is the fediverse. Mastodon is just a software.