Zynga has launched Mafia Wars and FishVille on Yahoo services including Yahoo Messenger, My Yahoo, Yahoo Toolbar, Yahoo Pulse, and Yahoo Games. These game integrations are the beginning of a much larger Zynga-Yahoo integration announced about six months ago. Yahoo users can play Zynga’s games without being forced to use Facebook Connect. Instead, users will have the option to use Yahoo services for their social graph. Mafia Wars serves over 23 million monthly active users on other platforms, while FishVille serves over 6 million.