Google Cloud Print iOS SDK by Conrad Kramer. It can integrates Google Cloud Print into Apple's AirPrint feature. This work uses AFIncrementalStore, AFOAuth2Client, and AFNetworking to communicate with the Cloud Print API, as mentioned by the author. Additional resources include prerequisites, how to build, and how to install.
MEA Mobile's Printicular App powered by the Walgreens API has passed four million prints. Walgreens will be speaking at the I Love APIs 2014 conference that will be held in San Francisco September 9-10.
As government regulators and consumers grapple with the extraordinary control and commercialization that Facebook exerts over personal data, and the extent to which Facebook has abused that privilege, a bigger question looms; what hope exists, if any for the emergence of a legitimate alternative?