Just watch account behavior, IP addresses... There are many real users who don't use their names for good reasons. Fake accounts are also used for false clicks,

Just watch account behavior, IP addresses... There are many real users who don't use their names for good reasons. Fake accounts are also used for false clicks, which facebook doesn't mind. And by the way, there are no way to really know if a name is real or not. Im just saying facebook use the real name requirement excuse... but there are other ways to fight fake accounts.