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After the earthquake in Haiti, a community of crisis mappers immediately began crowdsourcing open street maps in a way that has changed disaster response forever.  Using an open source stack and simple collaboration tools to combine and annotate image sets, usable maps were quickly put in the hands of rescue workers, allowing a rapid response that saved lives. 

And, is it repeatable in the future?  Johnson challenges the audience to consider ways that collaborative, volunteer efforts can be sustained.  It takes a passionate crowd to make crowdsourcing work, and the key to fostering that passion is relationships.