Although the private by default thing is a nice idea, here's the problem with the fridge's model:
What about the situation where someone in a group goes 'rogue' and invites people who other group members don't want to see their stuff? These new members will see everything already posted... I think it's an important principle that anything you post to a group should only be visible to members of the groups _at that time_... otherwise you have no real control over the info you share.
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Although the private by default thing is a nice idea, here's the problem with the fridge's model:
What about the situation where someone in a group goes 'rogue' and invites people who other group members don't want to see their stuff? These new members will see everything already posted... I think it's an important principle that anything you post to a group should only be visible to members of the groups _at that time_... otherwise you have no real control over the info you share.