"Iframe Post Proposal" and Unique Identifier Mechanisms Aim to Solve Facebook User ID Issue
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Facebook has outlined a new “Iframe POST Proposal” as a solution to prevent User IDs from being passed through HTTP refferer headers. The mechanism embeds the UID in a HTTP POST body ensuring that it will not be exposed in any HTTP Referrer header whatsoever (encrypted or otherwise).” The system should be easy for developers to implement.
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