App allows journalists to follow the crowd and find breaking stories

The startup Populace uses data from social media and other sources to display crowd densities at various locations across urban areas. As a result, the system could make it possible for journalists to find out automatically whenever an unusually large crowd gathers in a public place. We find out how it works from founder and Chief Executive Officer Chris Hawk.

Reporting by Lindsey Miller, Rachel Wise and Jessica King.

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Main image CC-licensed by Flickr via Hsing Wei.