https://www.techdirt.com/articles/20211014/15203647750/content-moderation-case-study-tumblrs-approach-to-adult-content-2013.shtml

Summary: There are unique challenges in handling adult content on a website, whether it’s an outright ban, selectively allowed, cordoned off under content warnings, or (in some cases) actively encouraged.Tumblr’s early approaches to dealing with adult content on its site is an interesting illustration in the interaction between user tagging and how a site’s own tools interact with such tags.

Tumblr was launched in 2007 as a simple “blogging” platform that was quick and easy to setup, but would allow users to customize it however they wanted, and use their own domain names. One key feature of Tumblr that was different from other blogs was an early version of social networking features — such as the ability to “follow” other users and to then see a feed of those users you followed. While some of this was possible via early RSS readers, it was both technologically clunky and didn’t really have the social aspect of knowing who was following you or being able to see both followers and followees of accounts you liked. Tumblr was also an early pioneer in reblogging — allowing another user to repost your content with additional commentary.