Online student response systems (OSRSs) are fast replacing classroom response systems (CRSs), also known as personal or audience response systems or "clickers". OSRSs can more easily be implemented in the classroom because they are web-based and allow students to use any browser and device to do the "clicking" required to participate. Their main attribute is their ability to motivate and engage students, enhancing or even replacing more traditional teaching methodologies. Through the example of Socrative, a web-based platform that runs on any device with a web browser and Internet access, this paper explains several pedagogical and administrative benefits of employing an OSRS as a teaching tool, with special reference to Japanese EFL learners.