Explore the innovative approach of Brigade in tackling civic engagement challenges during this Web Summit 2014 talk featuring Matt Mahan and James Windon. Delve into the platform's strategies for encouraging users to share opinions, methods of user engagement, and promises made to its community. Examine the potential impact of Brigade on political discourse, the risks associated with building a technology platform, and the reasons behind choosing Facebook as a model. Gain insights into the ongoing debate surrounding echo chambers and their effects on civic participation.