Facebook has an open redirector. It may be by design and the debate goes on about the use of these, but it is there nonetheless.
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# [+] Facebook Redirection
#
# [+] Author : 599eme Man
# [+] Contact : Flouf@live.fr
#
#[------------------------------------------------------------------------------------]
#
# [+] How use ?
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# http://apps.facebook.com/quizzname/?next=[Redirection]
#
# [+] PoC :
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# http://apps.facebook.com/quelendroitltwgzmv/?next=http://www.google.com
#
#[------------------------------------------------------------------------------------]