PC World is reporting this morning on a survey from IT security firm Sophos that says that "60% of Facebook users consider quitting over privacy". But we have one question - does anyone really believe that 300 million of the now estimated 500 million Facebook users are actually considering quitting? Sponsor In total, 1,860 visitors to the Sophos website responded to "an online poll asking Facebook users if privacy concerns might make them consider quitting the service", according to the company's blog post.