Stop publishing your information!
Most people do not understand how valuable information about them can be. One of the practices that makes me cringe most is posts that say something to the effect of Your rock star name is your favorite color and the street you grew up on. When you post your rock star name, you have given away valuable information about yourself that may be used to steal your online identity. There are countless examples of surveys, quizzes, and similar posts that may be innocuous but could just as easily be used to harvest information about people on social media.
The reality is if you live in a developed nation there are many databases that contain information about you. Some are maintained by nation states such as China or Russia, and some are maintained by bad actors who will sell their aggregated data to the highest bidder on the dark web for a variety of purposes. While it is impossible to ensure you don't exist in these databases, you can take steps...