Ping is/was a music-oriented social networking and recommender system service built into iTunes. Ping is/was also accessible via iTunes for the iPhone and iPod touch.
If you go to Ping in iTunes now – we know, who the heck does that?! – you get the succinct message from Apple:
Ping will no longer be available as of September 30.
That is all.
[Thanks to MacDailyNews Reader "Mike Taylor" for the heads up.]