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Facebook uses "signed requests" to communicate with applications on the Facebook platform. See `Facebook's
documentation on authentication `_
for more information.
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Initialize a signed request.
:param signed_request: A string describing a signed request.
:param application_secret_key: A string describing a Facebook application's secret key.
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A ``Page`` instance represents a Facebook page.
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A ``User`` instance represents a Facebook user.
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An OAuth token represents an access token that may be used to query
Facebook's Graph API on behalf of the user that issued it.
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