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In fact, Google also play the same trick - Android developers can only use Google for inapp purchase (digital item which is mainly used inapp).

Would be even more interesting if Google pull Facebook app out of the Android Play Store. (I bet Google would be very happy to do so)

The picture is clearly a web page: Apple has no say.

Would be interesting if users could make "in-app"-purchases via the fb app by momentarily going to mobile safari and then coming back. It's cumbersome but gets around Apple's policies.

Apple already rejects apps that switch out to mobile safari for payments.

Don't worry, if this workaround is popular enough, Apple will change its policy again.

And RIM is going down the same path with BlackBerry 10 and BlackBerry Payment Services. :-/

Not a fan of the trend, but I suppose it does unify the user experience.

Hence, FB has been trying to create its own phone/mobile OS.

If this is true I wonder how closely fb is working with Microsoft? Given that Microsoft owns a small part of the company they could be collaborating.