I’m setting out to develop a number of Facebook applications/games, which make use of some Facebook user information and stores game info in a database backend etc, in ActionScript 3.0.
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How can one leverage the new Graph API
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Should I use JavaScript or PHP as a “middle layer” or should I go with the ActionScript Client Library?
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Are there other libraries (Facebook / database / multiplayer related.) that could simplify the development of these Facebook games?
Your question is quite vague, but the Graph API has a very scattered documentation. Your best bet would be to ask on the forums for help using it.
The new Graph API (compared to Facebook Connect) will give you more information and is (IMO) easier to use.
Javascript is virtually required, though setting up the actually code can be a pain. I prefer to handle few UI events (namely login / out) with Javascript and then pass it back to a PHP class that will handle any view changes or for storing in a database.
Which to go with would depend heavily on what you’re developing. If you’re developing Flash games then you should probably just go with the ActionScript library. Otherwise I would go with PHP.