Systems and method for coordinating online activity with broadcast television are disclosed. In some embodiments, the system includes a coordination server configured to read a coordination index that includes: an identifier for online content stored on an online content server, where the online content is transmittable to a computing device for output on the computing device; and scheduling information of a broadcast event to be broadcasted on broadcast television. The coordination index associates the scheduling information of the broadcast event with the identifier for the online content. Based on the coordination index, the coordination server generates a signal to indicate a broadcast status of the broadcast event. Upon the signal being read by the online content server, the online content server transmits the online content to the computing device in accordance with one or more rules for interpreting the signal.