Anyone who's seen social media sites like Facebook has probably also seen scam ads that promise new features or insider access to the sites themselves. rudy_wayne writes Zdnet reports that a new whitepaper from antivirus company Bitdefender, which examined 850,000 Facebook scams over two years, shows that Facebook's own user experience enables these scams to flourish. The researchers found that scammers have infected millions of users with the same tricks over and over again — just repackaged. The most common tricks, such as 'Guess who viewed your profile (45.5 percent)' and 'change your background color' (29.53 percent) rely on a combination of the obsessions encouraged by the Facebook experience, and a general lack of understanding about Facebook's functionality — which, as most users know, is a constantly moving target. Users would be none the wiser that a given scam isn't just a new "feature" or another of Facebook's psychological experiments being done on users.