Ouverture de Facebook sur google chrome

Bonjour,
con je lance faceebook affiche ce message

Access to http://www.facebook.com/ has been stopped

Reason:
Your organization's internet use policy (Filtro Web Alto Policy for Filtro Web Alto Gruppo) prohibits access to this site content.
Website:
http://www.facebook.com/
Block List:
ListID - 7201

If you require access to this site or believe this site has been blocked incorrectly, please notify your local Network Administrator or IT Helpdesk.