Zynga is also the maker of FarmVille, which just yesterday was touted by a Facebook spokesperson as being bigger than Twitter in terms of an active userbase. The company followed up on the formula early last month with an aquatic-themed title dubbed FishVille, and now PetVille joins the ranks of of other popular pet simulation games like PlayFish's Pet Society, which borrow mechanics from popular casual Nintendo titles like Nintendogs and Animal Crossing.
In PetVille, you create and customize your own sugary cute animals, feed and care for them, and earn through gameplay (or buy) the resources to decorate your home, buy better food, give gifts to other players and so on. In the tradition of other Zynga titles and other casual social games on Facebook, MySpace and elsewhere, the game mechanics are relatively simple to learn and the titles are easy to pick up and play for short stretches of time -- leading to that addictive quality of reinforcement and reward that characterizes frequent revisitation of your virtual domain.
Check out a demo video of PetVille below and let us know your thoughts. Are you hopelessly drawn to any of these casual titles? It's okay to admit it: You're among friends here. Friends who may help you on your FarmVille farm.