> In which case government already knows? How? A citizen's own government might conceivably know who you work with professionally via the tax agency, but a for

> In which case government already knows? How? A citizen's own government might conceivably know who you work with professionally via the tax agency, but a foreign government doesn't (not without specifically requesting such data on a case-by-case basis). For most people who use Facebook, their list of contacts will provide any big data analysing actor with a very nice outline of their life and interests, especially if you are the type of state actor that can coerce Facebook into cooperating. Even if your own profile is clean and seemingly meaningless, mom will have you tagged as her son/daughter, and who you communicate with and when will quickly filter out the uninteresting friends.