In 2008, Ushahidi first mapped post-election violence in Kenya using information sent in by people via sms or online. Since then, thousands of organizations have used Ushahidi or other mapping tools to crowdsource information and present it on a map. The uses have been myriad, from mapping the crisis in Haiti after the 2010 earthquake to getting feeback about dangerous bike paths in Berlin.

After all, crowdsourced maps are often an easy way to put visuals on a web page and show what’s happening in places that reporters or rights activists can’t or don’t get to. But this doesn’t mean media organizations or advocacy groups can slap together an online map and people will automatically start sending reports. Many crowdsourced reporting projects are unfortunately short lived, attracting few reports and having little impact.

HarassMap has won several awards for mapping incidents of sexual harassment in Egypt. onMedia takes a look at what the organization has learned since it launched in 2010.

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