# Tweet by [@keefmoon](http://twitter.com/keefmoon) on 2013-03-02 01:00:14 > [!INFO] Archived from [original tweet](http://twitter.com/keefmoon/status/307656560082055168) RT @atnan: PSA: If you’re validating tweet lengths in Cocoa, use -[NSString precomposedStringWithCanonicalMapping] (i.e. Unicode Normali ...