Thomas Kirchner presented on using mobile technologies for rapid response tobacco surveillance. Some key points include: 1) Mobile phone penetration in the US is over 96% providing an opportunity for large scale public health surveillance. 2) Ecological momentary assessment (EMA) using mobile devices can provide dynamic, real-time surveillance but challenges include privacy, reliability of data, and data processing. 3) Rapid learning studies using mobile technologies may help answer public health questions more quickly through prospective cohorts, iterative design, and rapid analysis cycles.