This study describes how we used a prototype e-participation platform as a digital cultural probe to investigate youth motivation and engagement strategies. This is a novel way of considering digital cultural probes which can contribute to the better creation of e-participation platforms. This probe has been conducted as part of the research project STEP which aims at creating an e-participation platform to engage young European Citizens in environmental decision making. Our probe technique has given an insight into the environmental issues concerning young people across Europe as well as possible strategies for encouraging participation. How the e-participation platform can be utilised to support youth engagement through opportunities for social interaction and leadership is discussed. This study leads to a better understanding of how young people can co-operate with each other to provide collective intelligence and how this knowledge could contribute to effective e-participation of young people.