# Tweet by [@keefmoon](http://twitter.com/keefmoon) on 2011-12-01 11:40:07 > [!INFO] Archived from [original tweet](http://twitter.com/keefmoon/status/142206335482740736) RT @PeerIndex: GCHQ has launched a code-breaking challenge via social networks http://t.co/Y4mNJoPX