Lemmy.world was just migrated to a dedicated server: https://lemmy.world/post/75556

Verge: Reddit crashed because of the growing subreddit blackout

Apparently it's Cloudflare having issues: https://www.cloudflarestatus.com/

Also Reddit seems to be back up again.

The problem is, that if you have an account at InstanceX, and you are browsing the website of InstanceY, InstanceY doesn't know where your account is. I think to solve this problem, there would need to be a browser extension that knows where your account is (you configure it) and that converts Lemmy addresses to point to your instance.