The Internet, mobile phones, and social media can facilitate evaluation at all phases of a health communication project, including formative, process, and outcome evaluation. The main advantages technology affords for evaluation of communication programs include reach to large numbers of people, automation and better control of data collection, and more rapid implementation of evaluation. At the same time, technology-based evaluation can suffer from lack of detail and inadequate representation from diverse audiences, as well as problems in achieving data from probability samples.