Many of my friends are crushing on this popular game. I've played it on my Android phone before but had to uninstall it, it's too addictive for me to manage.
The App developers are so smart they make you run out of life but you can easily request for extra life from a Facebook friend that have at any time before played the game.
Why?
To keep you perpetually glued to the game. Even when you don't want to play, a friend's life request that comes through Facebook notification is a good bait.