# Tweet by [@keefmoon](http://twitter.com/keefmoon) on 2011-04-03 12:25:48 > [!INFO] Archived from [original tweet](http://twitter.com/keefmoon/status/54519971820216320) In reply to: [@None](http://twitter.com/None/status/54140372179361792) @aral is that built in? That's very cool, but how would it be useful? Can Apps use it?