Excerpt from this article:
The issue of fake social media accounts masquerading as public figures is acute. Facebook, Instagram and Twitter teem with accounts that mimic ordinary people to spread propaganda or to be sold as followers to those who want to appear more influential. But millions of the phony profiles pose specifically as actors, singers, politicians and other well-known figures to broadcast falsehoods, cheat people out of money — or worse. Last year, Australian authorities charged a 42-year-old man with more than 900 child sex offenses for impersonating Justin Bieber on Facebook and other sites to solicit nude photos from minors.
The sheer volume of social media impostors poses a challenge to even the wealthiest celebrities. In a video last year, Oprah Winfrey warned her Twitter followers that “somebody out there is trying to scam you using my name and my avatar on social media, asking for money.”