By John Murrell

If you’re going to launch a new social network in this hotly competitive market, it helps if you start with a devout fan base of millions ready to crash the doors the moment the ribbon is cut. Apple announced today that in the 48 hours since it was released, iTunes 10 has been downloaded by more than three million users, and more than a third of them have joined Ping, Apple’s new network for sharing and discovering music.

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