Reddit user (or, as they say, redditor) thefuc has posted 100+ links to Reddit discussions of questions about Roman history. Samples include:
What are the current views on whether there was a post-Roman mass-migration of Anglo-Saxons to Britain during the dark ages or whether it was mainly a cultural and technological change with the ruling classes most affected by warrior migration?
I haven’t read these,; but it’s a really interesting model, especially if the threads are good. (If they’re not, they’re an interesting model of something else.) It indicates one way knowledge works at scale: Thousands of questions and discussions, and a culling that addresses both some of the basics but also many of the quirks. Pretty damn fascinating.