If you give out a lot of personal information in your posts. Like the small town you live in. Your family history and structure. The places you've lived. The type of work you do. Your age. Your birthday. Pictures of yourself. Details about other family members. That info can be collected and cross referenced with purchased info from advertising and political databases and various personal info/interest data collectors like Facebook.
If you post enough detail about your life here, someone can figure out who you are by a process of elimination. Now why anyone would want to...maybe you revealed that you know an important person that the bad guy wants to influence, or demonstrated that you have a high income, or that you have lots of assets and seem unconcerned about security...Most os us are not interesting enough. But this one way a few unlucky people get targeted by bad people for scams and worse.
When you’re accustomed to privilege, equality feels like oppression.
"Power without love is reckless and abusive, and love without power is sentimental and anemic." - Dr. Martin Luther King Jr