The document discusses two case studies of citizen participation during disaster situations through social media and online platforms. The Virginia Tech shooting saw citizens contribute through a discussion board to collectively understand and respond to the event. The Britain blizzard saw all citizens able to contribute equally through automated information aggregation. While both were successful examples of citizen participation, they differed in their mechanisms and contexts. The author proposes a morphology to better understand what citizen participation mechanisms work best for different disaster contexts and levels of task complexity.