With an exit far more quiet than its heralded beginnings, Ping officially closed two years and a month after it was launched on Sept. 1, 2010. If you happened to have your iTunes still open from yesterday, see Ping in the menu, and click on it, you'll get the message seen above. Hit OK, and Ping disappears from your iTunes forever.
Ping has been succeeded by Facebook and Twitter integration in iTunes.
[Source: TUAW]