Why does the lawyer keep bringing up "a hundred people"? Is there some kind of official policy where FB respects your privacy if you share with 99 or fewer peop

Why does the lawyer keep bringing up "a hundred people"? Is there some kind of official policy where FB respects your privacy if you share with 99 or fewer people? Or is it some calculated legal argument to emphasize that anything shared publicly on FB is going to be seen by plenty of people?