It sounds like while pregnant, but it’s really a new feature rolled out by Joshua Schachter and co. It works like this: if you come across a link you think one of your cohorts might like, you can send it to a special “sent by others” inbox by tagging it for:username. To check out what others have sent to you, go to which, via the magic of cookies, will take you to your “inbox from others” (assuming you’re already logged in).