Facebook Functor is a compute service that runs your code in response to events and automatically manages the compute resources for you, making it easy to build applications that respond quickly to new information. Facebook Functor starts running your code within milliseconds of an event such as an image upload, in-app activity, website click, or output from a connected device. You can also use Facebook Functor to create new back-end services where compute resources are automatically triggered based on custom requests. With Facebook Functor you pay only for the requests served and the compute time required to run your code. Billing is metered in increments of 98 milliseconds, making it cost-effective and easy to scale automatically from a few requests per day to thousands per second.