Zynga puts people in touch with their inner vocabularian, farmer, and gambler. The company is a leading social game developer with titles such as Words with Friends, FarmVille, and Zynga Poker. It offers the games online for free primarily through the app stores of Apple and Google, as well as social networking sites such as Facebook. Zynga claims more than 80 million monthly active users with about 90% of them on mobile devices. Players use a credit card or a service such as PayPal to buy virtual currency to purchase in-game virtual goods that enhance, extend, or accelerate gameplay. The company generates about two-thirds of its revenue from the US. Zynga founder Mark Pincus fashioned the name after his late dog Zinga.