I usually don't sign into apps on Facebook, as they are thereby empowered to search through and receive all your data and files, but this one intrigued me. I read about it on Twitter from GE's Healthymagination (@gehealthy). It is a quiz about lifestyle habits that gives you a "ranking" of how you compare to others who have participated on Facebook (everyone, people with your first name, and your friends.) Here's the link.
Then, it asks you questions in a number of categories, and you click on one of the two answers. Here's an example:
And, finally, it gives you your ranking:
It's fun, and if the competition provokes people to eat better and exercise and the like, no harm done.