Clear Channel's iHeartRadio, the digital music and live radio streaming service, today announced that it has surpassed 50 million registered users. iHeartRadio reached this milestone in three years - faster, according to the company, than any other streaming music platform and even faster than Twitter and Facebook. Of course, having America's largest broadcast radio group sing your praises daily, hasn't hurt. This figure does not account for the millions of users who listen to the service's live radio functionality without registering, indicating that the app's total reach is even greater. iHeartRadio Network visitors grew to more than 97 million monthly...

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