The best advice my father gave me about the internet: assume everyone is a rapist who will stalk you and put you in a van if you say anything that can be traced

The best advice my father gave me about the internet: assume everyone is a rapist who will stalk you and put you in a van if you say anything that can be traced back to you. Ironically enough I use uber under my real name and I'm fine, but everyone I know how uses their real name in social media has had problems.