The dark underbelly of society is not something we like to think about — much less talk about — but it’s there. An app named TraffickCam shines a light on human trafficking, and lets you intervene without getting involved. After downloading the app, all you have to do is snap four pictures of a hotel room you’re staying in (as well as note the hotel’s name and location). From there, those images are added into a national database authorities can use to cross-reference images found online. “Right now there are pictures posted every day. Hundreds of pictures, in every city…

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