The Google Face Detection Python Sample Code by Google Vision presenting how to integrate face recognition into web services and mobile applications, providing callbacks as resources to send requests and receive responses in return.
As the amount of processing power that can be affordably invoked via the cloud continues to increase, applications that were once thought too impractical to build are suddenly quite feasible. A good example of that is AppStream, a new service that Amazon is beta testing that allows graphically and resource-intensive applications to be extended out to any number of devices that previously would not have had the processing capabilities to run them.
Handling API calls in the cloud with a service like AWS Lambda is one of the latest ways enterprises try to save on resources. In theory, you can save a ton of money. But be careful. Costs for API calls can mount up, sometimes leaving you with a cloud computing bill ten times the size you expected.