Is facebook safe for teen agers

[nikhil]

A facebook is most viewed site of internet.but now a dayz some users missused a facebook.which creates a problem to all.
why dont the users understand the policies and procedure of it.
The teen agers are so much excited by using it ,but they dont understand the real meaning of it.
They used and chat with the unknown peoples also ,which will create the problems to them...
My questions arises for the all viewers:-
Is it safe for teen agers.
Should parents allow the teen agers to use it,should facebook provides the security more .
viewers should be alert and make sure that there ID is safe.