That is one of the biggest real world problems that is solved with Blockchain. With YouTube, Facebook, Twitter, Instagram, Snapchat.....etc you don't have true ownership of your account or you funds in the case of YouTube. Facebook is one of the worst viruses I have ever seen. Worse than Wannacry. Don't ever have Facebook on a phone that you have connected to the cellular network. It will try to steal your phone number and connect everything.