I also love another of their programs, Fanlore[0], a treasure trove of obscure internet fanfiction works, social groupings, and tropes. Sort of a combination oral history + TVTropes-esque fanfic breakdown.
Fanfiction is a beautiful thing and a great way to stretch creative writing muscles that can be helpful by being a bit less of a blank canvas than needing to invent characters and locations. Of course, a TON of fanfiction does invent, liberally, but I've seen people insist they can't write creatively, then make something beautiful when you ask them to rewrite a scene in their favorite show or book that they were disappointed with and boom, they just wrote their first fix-it fic[1].
Also, praise be for AO3 having no news feed/algorithm, and instead an incredibly intricate tagging system. Makes it easy to find what you want, avoid what you don't (see free speech commitment), and feel liberated from algorithmic exhaustion.