The truth is that this overexposure on the internet hasn’t caused much more harm than before social media. Most people, not all, but a majority have zero bad intentions. So sharing details about yourself to a mass audience is screaming in the void. Nobody cared about your life before it was on the internet, nobody cares now. Social media companies selling your data is for a shitty reason but not an unethical one. They just want to sell you stuff and they are salesmen that know everything about you.
On the other side, people who want to do bad things can and will regardless of details about someone on the internet. Stranger danger is a fallacy and the person who can/might victimize you is someone you already know. Sure, maybe it saves time, but it doesn’t really change victimization. People can stalk someone in real life, can steal their mail, can social engineer the people around their victim, it’s just a bit easier when a lot of it can be done by befriending someone on social media.