Back in my door-slamming phase, I would get in BIG trouble for slamming said doors. One time my dad straight up removed the door from its hinges. He told me that privacy was a privilege, and I had just lost it for a week. Most people treat privacy as a right. But I'm more inclined to agree with my father. If you post everything on social media, you forfeit any nonexistent right you have to privacy in terms of that information,

That's not to say it's morally acceptable to go through all your roommates things. Or break the lock on your brother's diary and read it. But privacy is an extension of trust. And trust has to be earned, I'm told. There's a basic level of trust and privacy that comes for granted until given reason to revoke it. 

But privacy is a privilege you can grant yourself, to a certain extent. Lock that diary up. Keep no physical records of your marital affairs. Keep your thoughts off your facebook page. Not to mention the less people know of you and your schedule, the less easy a target you will be for ill will. Thieves know when you're on vacation- because you posted it on Facebook. People you've wronged know that they can trigger an allergic reaction by wearing a certain perfume- because you posted it on Facebook. And that job you didn't get? It's probably that photo you posted of your new bong or something equally frowned upon.

Essentially, if you want to complain about people knowing too much about you- chances are it's your own damn fault.