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Ping is Apple's music-centric image-oriented network that is integrated into iTunes 10. From a privacy standpoint, it's pretty straightforward--as opposed to Facebook's multitude of privacy settings--but then again, Ping is also very limited as to what services it offers. In either case, here's a quick run-down of the privacy features present in Ping.

Ping is off by default, but when you click Ping in the source list on the left-hand side of the main iTunes window, you'll be presented with a message describing what Ping is, and a button that lets you opt in to Ping.