It will also make you think twice about posting something that criticizes the government. Or an opinion that your boss, or your father-in-law may disagree with.

How would you make a post on a forum dedicated to helping people overcome their problems with alcoholism, drug addiction or sex addiction - without potentially outing yourself to everyone you know? How do you join a support group for people living with HIV, or those who have been sexually assaulted, or people with an eating disorder without airing incredibly personal laundry in public? How do you seek advice on coming out as gay? Or suspecting that your parents might not be your biological parents? Or that your children aren't your biological children?

These are trivial off the top of my head examples, usually reserved for the "if you've got nothing to hide..." arguments.