The default position of any social network when it comes to sharing personal information should not to, Period. All "sharing" should be based on opt-in actions

The default position of any social network when it comes to sharing personal information should not to, Period. All "sharing" should be based on opt-in actions and not left to being opt-out. I've fully aware that many networks including the biggies like Facebook don't follow this mantra, but personal privacy laws (such as those that exist in Canada) should exist to enforce this fact.