Apple introduced Ping in iTunes 10-and in the process got rid of the Genius sidebar. It later rolled out a hybrid iTunes sidebar: The currently playing song shows at the top, with buttons to "like" or comment about it. A section called My Recent Activity shows you what your Ping friends have been doing (perhaps a way to keep Ping users coming back). But the third and largest section ushers in the return of the Genius sidebar. It's now a Genius Recommendations section that displays similar music from the iTunes Store-as long as iTunes can track down the currently selected song, of course.
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