This is more of something for you, personally, to track your overall mood whenever you want, wherever you are in the community.
Unlike the old one with emoticons (which is not going away), this is a way to quickly and easily track your overall feeling over time really easily.
I'm open to additional suggestions on how a member might use this, but I could see someone using it when they don't feel like filling out our more robust daily mood tracker --
http://psychcentral.com/quizzes/mood-tracker/
DocJohn