When now-ubiquitous Twitter first debuted in 2006, few knew what to do with it and fewer still foresaw its far-reaching commercial possibilities. But Twitter got a warm welcome compared to Yo, a free new app whose sole function is to let its users send the two-letter message “Yo” to their friends. Thought to be a joke at first, Yo has already found serious use among marketers, and restaurant social media gurus may figure it out next. Yo drew plenty of ridicule at first from the ...

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