Ping doesn’t actually publish any kind of information about your listening habits like last.fm does. All you can do is like music or comment on music. The only

Ping doesn’t actually publish any kind of information about your listening habits like last.fm does. All you can do is like music or comment on music. The only thing Ping publishes automatically (which is creepy enough if you buy a lot of music) is what you bought in the iTunes Store and who you followed. This button is just a little shortcut for functionality that already existed but was ridiculously inaccessible before.