Facebook does have the opposite ability though - they could make one appear to be whoever they want. If they were inclined to use their data and technology maliciously, against an individual, I think it's likely they could ruin that life pretty quickly.
A liberal constitutional democracy does not have any more ability to make you disappear than Facebook does.
And repressive governments already use Facebook to disappear their people:
>The Facebook posts were not from everyday internet users. Instead, they were from Myanmar military personnel who turned the social network into a tool for ethnic cleansing, according to former military officials, researchers and civilian officials in the country.
