For those simpletons out there who find it too taxing to compose a 140-character message, there is now YO. An app for your android or iPhone that sends the same 2-character message to anyone in your equally simple circle of firends. It's called (you guessed it) Yo.Think you can remember that, or do you need a link to it? http://venturebeat.com/2014/06/18/yos-digital-nudges-are-the-new-pokes-and-possibly-the-new-notifica...