Some SSL Error on trying to access Facebook..

Hey guys, since today evening, when I try to access Facebook, it suddenly gives me an SSL Error message saying,

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"You attempted to reach www.facebook.com, but instead you actually reached a server identifying itself as*.opendns.com. This may be caused by a misconfiguration on the server or by something more serious. An attacker on your network could be trying to get you to visit a fake (and potentially harmful) version ofwww.facebook.com.

You should not proceed, especially if you have never seen this warning before for this site."

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I emptied my cache and cleared history, cookies etc. Checked my domain name server, which is quite fine too. But the error persists. I don't know what to do. Help please!