I know that you are safe.
If there was any virus's or trojans on facebook games, there would be haywire, Zynga would get sued, facebook would be in the frame about how they could let Zynga and other game companies do this.
All 3 of those games are by Zynga, and would not contain any malicious content.
Their might only be tracking cookies, Like Ad.Yieldmanger.
But they can easily be blocked.