Disclosed are methods for coordinating advertising among at least two devices currently being used by the same user. A server receives information about what advertising is sent to a first user device. Based on that information, the server creates a “context directive” that specifies how to appropriately direct advertising to a second user device. The context directive is sent to a device that manages an advertising campaign for the second device. The context directive can be based on advertising policy rules set by campaign managers for the first and second user devices. The policy rules may be based on demographic information associated with the user of the second device. In some embodiments, a server collects information on advertisements sent to the various user devices, correlates that information, and produces a report. Advertising managers use this report to gauge the effectiveness of their campaigns across devices.