Nah facebook stopped being useful once my dad and aunt would read and post stuff there. It turned from a hangout at a friends place into sunday supper.
Well, the effect doesn't preclude the possibility that there are connections you specifically want to avoid. My point was just that the value of the social network is the connections - Facebook would be even less useful if none of your friends were on it in the first place. Managing who sees what in a way that jives with social dynamics is still something these networks are figuring out. Charging $50 is far more likely, however, to keep out my unemployed friends than my well employed parents.