How can we protect ourselves from face book cyber crimes ?

Now A days face book cyber crimes are on it's peak. It's become very difficult to keep our face book account private and safe.
Even we can say people afraid to have a face book account because of these crimes and the deaths of victims who affected by face book cyber crimes.
Scams, Cyber bullying,Stalking,Robbery,Identity theft,Defamation and Harassment are the most common face book cyber crimes.

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Do you have any ideas how can we protect ourselves from these crimes and criminals ?