Apple adds "like" feature to Ping music service.

Responding to critics who were lamenting about the lack of "social" aspect in its new Ping music social media service, Apple has added a new feature that let users both post the music they are actually listening to and to "like" other music that friends, colleagues or random strangers are listening to. The new feature is accessible via a sidebar that pops up within iTunes anytime one starts playing a song.
The way the service works is very simple: Whenever you are listening to a song, Ping will recognize it and automatically ask you if you want to put it in the "like" category and if you answer yes, will instantaneously, post it to your feed without any additional input. The add-on service also give users the option to leave comments alongside the song.
The tweak to Ping service, is a step in the right direction but doesn't satisfy the strongest critics.
To these critics, the limited nature of Ping to iTunes, makes it useless for songs who are not in the iTunes store. Unfortunately, Apple is not giving any indication that it is planning to move Ping into a browser-accessible service.

For more, see pcmag.com