How comfortable are you discussing your personal life (work, relationships, family) on social networking sites?

How comfortable are you discussing your personal life, work stuff, family issues, health of yourself and your family, mental health of yourself and your family, financial issues, etc. on social sites such as Facebook, Fluther and other places?

I realize that according to Fluther staff, it’s not considered a social networking site, but it is social in nature so I am including it here.