Square Enix successfully ported two of their made for GREE games to Facebook. You can collect loot and fight monsters drawn by Final Fantasy Tactics A2 artist Ryoma Ito in Knights of the Crystal.
Chocobo’s Crystal Tower is another social game with towers to climb and chocobos to breed. Here’s a video of a baby chocobo who grows up to dress like a gondolier.
Knights of the Crystal and Chocobo’s Crystal Tower are free to play, but both games use a cash-op system where players pay for virtual goods. Check out Chocobo’s Crystal Tower here and Knights of the Crystal at this site.
A hat tip and flock of baby chocobos to Alexis for sending the video.