i assume this is a facebook game considering it asked to do something with my facebook?
while i tend to stay away from those "types" of games (i cannot form a proper sentence to tell you how much i hate farmvile) this on the other hand looks decent enough so gonna give it a go.
EDIT: ok it's not a facebook game just a game that uses facebook for "social features" AKA useing people who are going to play it to viral and hype it to people on there facebook's.