579
Online Content Is Disappearing
(www.pewresearch.org)
This is a most excellent place for technology news and articles.
The technology is working against it too. App search engines are just spam ads now and will never find that niche forum that has what you are looking for, like they once did 20 years ago.
I remember finding them in web directories, populated manually by people, and from people sharing links.
A search engine was the brute force approach, and you'd find something useful after some manual work on 20+ page of results.