1. A system for determining context in a first mobile computing device, the system comprising hardware including a processor and a data store containing instructions that, when executed, cause the computing hardware to implement: a context indication manager module to store current context representing a current user activity or environment in which the first mobile computing device is used; a decision module to generate a query for transmission to a remote community context service; and a communicator module to obtain community context information from the remote community context service, the community context information being based on a remote context determination of a second mobile computing device determined to be similarly situated to the first mobile computing device according to community membership criteria; wherein the context indication manager module is to update the indication of the current context based on the community context information.