# Tweet by [@keefmoon](http://twitter.com/keefmoon) on 2013-02-06 07:29:26 > [!INFO] Archived from [original tweet](http://twitter.com/keefmoon/status/299057198141689857) RT @jamesjyu: Think you know Objective-C Blocks? Try our quiz: http://t.co/gMsOq6bk