# Tweet by [@keefmoon](http://twitter.com/keefmoon) on 2017-03-08 20:17:15 > [!INFO] Archived from [original tweet](http://twitter.com/keefmoon/status/839570731876958210) In reply to: [@rennarda](http://twitter.com/rennarda/status/839501040764530688) @rennarda @lukeredpath weak and unowned represent different situations weak: Don't retain, may not exist when accessed. ...