On the Internet, scammers dabble over and over again. One most recent example shows, that audacity has no set limits on the net. The last "Call Of Duty" title is not even half a year on the market, and yet a new title gets announced. On a website, beta keys for "Call Of Duty: Modern Warfare 4" were offered. Strange, that to date there has never been an official beta for "Call Of Duty".
Now it's been proved, that the website "modernwarfare4beta.com" actually is nothing else but a fake. The website's purpose is to get to know credit card numbers and other private data of users.
Activision and Infinity Ward caution explicitly against fake sites as mentioned, which, for instance, raffle "Modern Warfare 4" beta keys for Facebook likes and whatnot - so don't let yourself get ripped off!