yes, I agree with you, facebook has some security issues. even at times I heard that a few applications donot wait for your permission and get accepted.
If one thinking for latest updates and facebook hackers are really advance and they have proved that facebook is not really secure in nature. But still people can save there privciy if they follow pricy policy of facebook and no hacker can hack the account.
Still I think that facebook is really secure in nature you can see some of pricy and security policy of facebook by following link