Rapid growth since incorporation has triggered a chain of products, acquisitions and partnerships beyond Google's core search engine. It offers online productivity software including email (Gmail), a cloud storage service (Google Drive), an office suite (Google Docs) and a social networking service (Google+). Desktop products include applications for web browsing (Google Chrome), organizing and editing photos, and instant messaging. The company leads the development of the Android mobile operating system and the browser-only Chrome OS for a class of netbooks known as Chromebooks. Google has moved increasingly into communications hardware: it partners with major electronics manufacturers in the production of its "high-quality low-cost"Nexus devices and acquired Motorola Mobility in May 2012.[22] In 2012, a fiber-optic infrastructure was installed in Kansas City to facilitate a Google Fiber broadband service.