Proposed Law Would Require Social Networks to be Private by Default
networkeffect.allthingsd.com
networkeffect.allthingsd.com
"For instance, if the default settings are all private, it could be hard for new members to get value out of the sites because they won’t be found by other users."
In other words, if the customers weren't ignorant and knew how the change their info to private, the system would fail. (We know they're calling the customers ignorant, because private-by-default means the system fails because users don't change their info to public. Their logic always assumes the customer isn't smart enough to change from the default value.)
This ted talk is an excellent and talks about the very significant differences in organ donation rates between countries that use an opt out system vs. those that use an opt in.