What is a friends Dance Off tournament, and how do I enter them?

The friends dance off tournament runs at the same time as the regular dance off tournaments.  Everyday there is a new friends dance off tournament.  To enter the friends dance off tournament, you will need to complete the regular dance off tournament.  The score that you get during that dance off tournament will then be compared to your Facebook friends and the player with the highest rank will win the reward.  You will need to have at least one other friend on the leaderboard to collect your friends dance off reward.