If your app is resistant to malicious use, ie the gathered data is presented to the user only from which it was taken....... than I would suggest to shift your api calls from Server side to client side. Do all the api calls on client side and POST them to your server for processing using FBJS. Even limited processing can easily be done on client as well.
I do similar kind of stuff for google-spreadsheet. Download the row data and process using Javascript rather than sending query parameter to be processed by google-doc servers. My 2 cents ... :)
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