I ran into this a while ago reading something on my phone which wasn't logged in. I think it is only certain answers though. It's funny that Stack Overflow was

I ran into this a while ago reading something on my phone which wasn't logged in. I think it is only certain answers though. It's funny that Stack Overflow was created explicitly to provide an open access QA site, an alternative to Experts Exchange. Now Quora, who clearly owe a lot to SO, are going back to that closed model. I hope they change their stance on this, it's not a healthy way to run a user generated website.