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    <p>Facebook Ids are pretty hard to make up (at most a user will only know their own). Depending on what you store in the database (which will not be anything that the user cannot get on their own, unless you ask for extended permissions)</p> <p>If you are worried about a user trying to get information from the database, add an access token or signed request to each row and us that and facebook id to get data. That will greatly increase security.</p> <p><strong>EDIT</strong></p> <p>There are few occasions where you get a signed request from a user:</p> <pre><code>* A signed_request is passed to Apps on Facebook.com when they are loaded into the Facebook environment * A signed_request is passed to any app that has registered an Deauthorized Callback in the Developer App whenever a given user removes the app using the App Dashboard * A signed_request is passed to apps that use the Registration Plugin whenever a user successfully registers with their app </code></pre> <p>Signed requests will contain a user id only if the use has accepted permissions though, and are not passed again if the user enters the application, and accepts permissions (meaning that the signed request would not contain the ID). Because of this saving an access token may be a better idea. Here is more on the <a href="http://developers.facebook.com/docs/authentication/signed_request/" rel="nofollow">signed request</a></p> <p>Also the signed request is in the url (param = "signed_request"). I always parse it through c# but I am sure you can at least get one through javascript</p>
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    1. COHaving done a bit of reading, ideally what I'd like is an encrypted string from facebook which contains the users uid, which I could then go and read using my fb app's secret key. It appears that a signed request would fit this description perfectly, however I am unaware of how I could call one of these on request? Ideally using the javascript API. If anyone knows if this is possible I'd love to know. The fb access token is something that I can find on request, but the uid isn't encrypted, being just a string in the middle of it.
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    2. COLook at the edit
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