These two examples seem to be relegated to very specific subpopulations, that are doing something that would easily attracy Facebook's attention - nameley ident

These two examples seem to be relegated to very specific subpopulations, that are doing something that would easily attracy Facebook's attention - nameley identifying as the opposite gender they did previously. The overwhelming majority of people can probably make a profile with a false name and use Facebook without issue. Ultimately, though, people probably don't use fake names on Facebook because a large portion of the service's value is lost when trying to keep one's identity obfuscated. None of your friends, acquaintances, or co-workers will recognize the profile with the false name. Unless the profile picture is real, but that opens a vector for the government to find out in the real identity of the user too.