Facebook reported last week that it had 955m active users, but how many of those are fake? The social network has provided some details in an SEC document filed this week. In it, Facebook reveals that around 4.8% of its active users are “duplicate” accounts – people with two or more profiles. Meanwhile, “user-misclassified” accounts are another 2.4% – where people have created personal profiles for businesses or even pets that should be Pages – with another 1.5% being “undesirable accounts” (i.e. spam). In total, that means 8.7% of Facebook’s active users are duplicates or not real people – 83m people in total.