Twitter and Billboard are set to launch a new chart that will rank which music is being shared and tweeted about the most in real-time. Twitter and Billboard are set to launch a new chart that will track the music being shared and tweeted about the most in real-time._It will be visible on the Billboard website and, according to The New York Times, debut next month. Billboard says the new real-time charts rank the most successful tracks being talked about at any one time, as well as those that have remained popular over a longer period of time. It’s an...

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