In case there weren’t enough social networks, Apple’s Ping is the network for music, not friends. From NY Times:
On Thursday morning, Steven P. Jobs, Apple’s chief executive, showed off a new social network for music called Ping. It runs inside the newest version of Apple’s iTunes software. Ping also works on the latest software for iPhones and iPod Touches. (Apple hasn’t made it available for iPad this time around.)
Ping, Mr. Jobs said onstage at the announcement event in San Francisco, lets its users answer three burning questions: “What are my friends listening to? What are my favorite artists up to? What concerts are my friends going to?” And, he said, it resolves the driving need, “I’ve got to share this with my friends!” (It also answers the question: “Can I buy that song right now?”)
How does Ping work? Mr. Jobs describes it as “sort of like Facebook and Twitter meet iTunes.