An app that just sends “Yo!” to your friend’s phone

Israel’s Or Arbel has built a smartphone app called “Yo!” that with one click sends a “Yo!” sound to another smartphone. The app has over a half-million users.
http://www.bloomberg.com/news/2014-06-20/don-t-blame-silicon-valley-for-the-stupid-yo-app-blame-israel.html
https://www.youtube.com/watch?v=4eYekudMZaw

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