I've been asked to do Facebook apps. Before I commit to anything, I want to know how easily a game can be moved to Facebook? (I'm completely comfortable making games in JavaScript in the browser.)

Does Facebook filter the JavaScript in some way? Can I use jQuery or other JS libraries? Can I do animation by altering the DOM on the fly? Is it best to go with an iFrame or use FBML?

I've done some poking around the Facebook dev site. But I'd like to hear from someone who's done it what the learning curve is like.

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