Particular embodiments provide a system to support orchestration of media assets that are delivered across multiple media spaces, time, and multiple device types in a coordinated manner. The system exposes a sequence of media assets to a user under media space, time, and device constraints. A campaign may be broken up into multiple media assets (e.g., different creatives, such as advertisement creatives). To target a user across different media spaces, the system may generate spanning rules based on metadata concerning multiple media spaces, time, and multiple device types for the campaign. An analytics service may provide analytics information for the delivered media assets to allow the coordination to continue in the sequence. Also, the analytics information may be used to change the spanning rules for future delivery of media assets.