Facebook privacy - are you worried?

Gooner

I have been worried about Facebook privacy long before this scandal broke out. It was about 10 years ago, one of my friend's Facebook page got hacked and this "hacker" used his Facebook page to ask every single of my friend's friends to offer him money as "he" said he was in a trouble and urgently needs $3000 to bail him out. Luckily my friend realised his problem and notified Facebook. However, it took him a while to re-organise everything on new Facebook page and fortunately according to my friend, no one has lost any money, but he did lost the time and the hassle to re-organise his life. I asked him was it to do with Facebook itself or soemthing else. He suspected that one of his associates might got someone involved in such incident. My friend never disclosed his personal password and important personal details on Facebook page, but someone he got into trouble. He did have his personal security setup quite high. Despite all his efforts, I know he is very active on Facebook, but somehow, someone managed to hack into his Facebook account. So far even Facebook didn't mention to him how the offender manage to hack into his account. My question is, "Was that has something to do with his own privacy settings?" It seems to him that someone came to his Facebook page through a back door.
My advice is to set the privacy setting to maximum and never disclose any sensitive information on any website and not just Facebook. Always monitor your privacy settings and activities every now and then. To be honest, I don't use Facebook often. Having said that, I do use Facecbook Messenger from time to time to contact with my friends. Even in our chats, I never disclose any sensitive and too personal information. Because no one really knows is there anyone "listening" in the background. It is better to play safe and not to feel sorry later.