Assassin's Creed Facebook Game Explained

Assassin's Creed: Project Legacy is a Facebook game that connects to your Assassin's Creed: Brotherhood game. By linking your Facebook and Uplay account you'll be able to reap the benefits of each game.

For example, sending assassins on assignments in Brotherhood will unlock missions in Project Legacy. By doing these missions Ezio will then be rewarded in Brotherhood. Some things like the Auditore and Medici capes can only be unlocked by playing both games. You can find Project Legacy here.