He's wrong about not being able to link to song information on iTunes. That's been possible for about a year. What's interesting is that presumably this is because at a certain point (once they had secured the market) Apple found it more beneficial to expose this information to the web than to keep it behind a wall.

I wonder this will apply to Facebook too. Perhaps when they're secure enough to not worry if Google simply sucks out all their data, the benefits of being the central but open resource will outweigh the benefits of being a one way valve.