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.

https://www.nytimes.com/2018/10/15/technology/myanmar-facebo...

So, the notion that it's somehow "safer" for Facebook to engage in omnipresent surveillance doesn't prove true.