Comments can mention users with the syntax @username. If that user has mention notifications enabled in their settings, they will get an e-mail or Pushover notification. In either case, @username is automatically turned into a link to /u/username. This was contributed by @rob.
RSS links on
/newest now point to a user-specific URL when logged in. These carry a per-user token so that when the feeds are added to a 3rd party RSS reader, the feeds will still honor the user’s tag filters and any other things that may be added in the future.