I’m less active on non-Nostr social media (Twitter) in general so I may not be the best representative. For me:

- SMS, Email, and LinkedIn DMs are how I talk one v one, and that’s still how I share most papers I come across
- OpenReview is a great system for actual reviewing of papers that is in the public domain, although a more formal process
- lots of folks like subreddits like r/machinelearning
- ResearchGate is one of the best platforms to directly request a paper from an author that is otherwise behind a paywall you don’t have access to. When you publish behind paywalls (less common but sometimes still requires) authors maintain the ability to share 1 v 1 with anyone, they just can’t post publicly
- Twitter is where most casual short form discussions happen

I started a moderated community called AI-papers and posted a paper review but then didn’t really pursue sharing that - one issue was someone had a pending post but I didn’t have a way to get notified so I saw it super late