• Google to find subreddits. Usually there are several.
• Raid subreddit sidebars and wikis for links, discussions, FAQ
• Take blogs you like and search by domain. Ex: reddit.com/domain/lesswro…
It is an incredible resource though! You can instantly drop into any niche and sift through years of content and discussion.
• r/slatestarcodex
• r/HPMOR
• r/rational (rational fiction)
• r/transhumanism
• r/singularity
• r/Nootropics
• r/skeptic