Winter 2015: Naughty or Nice

What does "naughty" do? My first few times, I selected naughty or nice randomly, trying to see which was best for me and my neighbors. At first, I was thinking my selection had to match or unmatch someone else. Later, I was guessing that "nice" might somehow be more co-operative... even though I still don't know how.

Shouldn't someone post a chart at the start of this topic? And then suggest why always "nice" might be the best strategy?