Why does Gwibber show a security warning when I try to authenticate my Facebook account?

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http://askubuntu.com – When I try to Authorize in the end, it shows: Success SECURITY WARNING: The above URL is NOT NOT VALID FOR A CASH CARD OR GIFT CARD. Giving away the URL may result in your account being HIJACKED. and Gwibber doesn't connect to Facebook. (HowTos)