Related:

• Dear Emily: How can I choose what groups to post in?
  -- Confused Dear Confused: Pick as many as you can, so that you get the widest audience....
• Algebraists do it in groups.
• Cluster analysts do it in groups.
• Congregationalists do it in groups.
• Design flaws travel in groups.
• Mathematicians do it in groups.
• Pizza IS the four food groups!
• Mud is not one of the 4 food groups.