If they just store secret without anything else, that would be pretty hard to get back to the original author though. I don't know a lot about security, but if

If they just store secret without anything else, that would be pretty hard to get back to the original author though. I don't know a lot about security, but if they remove the whole "linked friends" part, I would qualify it as safe. On the other hand I guess the whole point is knowing your friends secrets, not just people secrets.