Facebook certificate not valid

i open my fb accont than one error occour that is " server certificate is not valid"
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More about facebook certificate valid
  1. darpan333 said:
    i open my fb accont than one error occour that is " server certificate is not valid"

    http://www.ehow.com/how_5094365_fix-certificate-error-windows-computer.html

    or

    https://userscripts.org/topics/88897
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