In the 2003, more camera phones were sold worldwide than digital cameras. With this new platform, we can leverage regularities in the spatio-temporal context and social community of media capture and use to infer media content. We created and deployed a “Mobile Media Metadata” (MMM) prototype on Nokia 3650 camera phones with 55 users that uses “context-tocontent” inferencing, a shared metadata ontology, and user interaction at the point of capture to effectively infer media content annotations, specifically the semantic description of the location of the subject of users’ photos. Categories and Subject Descriptors H.5.1 [Information Interfaces and Presentation (e.g., HCI)]: Multimedia Information Systems; H.3.1 [Information Storage and Retrieval]: Content Analysis and Indexing; H.3.3 [Information