There are legitimate reasons to change one's public name, too. A victimized spouse hiding from their abuser comes to mind. I am friends with a few indie authors

There are legitimate reasons to change one's public name, too. A victimized spouse hiding from their abuser comes to mind. I am friends with a few indie authors who write under a pen name, and that pen name is what they go by on Facebook. One does it for day job security; she's an elementary school teacher by day, supernatural erotic fiction author by night. She tries to keep her working life and personal life completely separate. Thankfully Facebook hasn't caught on to any of them doing this, or they would lose their connection with readers and friends alike.