As my co-founder Isaac recently pointed out, "Even Apple has its failures" and one of those is Ping, the music social network Apple is pulling as of September 30th. (If you haven't heard of, or never used, Ping, that's probably part of the reason why).
Apple is a tremendous company that I respect greatly. It's a good lesson that even the most valuable company in the world can't do everything well. There's something magical about maniacal focus.