Itunes 10

Finally, iTunes got an update and becomes more social with Ping, a music-focused social-networking component that's a cross between Facebook and Twitter, built right into iTunes 10.

Interestingly, Apple has some new partners it didn't necessarily play-up during Jobs' presentationwhen you click on the "tickets" link for a concert your friend writes about in a Ping update, for instance, you are sent to Ticketmaster's page for the event, via Safari

Source: http://www.pcmag.com/article2/0,2817,2368618,00.asp