BBC Trending travelled to Iguala in Mexico to meet families who've turned to social media to help find their missing loved ones. More than 25,000 people have disappeared in the country, most of them the victims of drug cartels.
Horrific recent cases, such as the 43 students who went missing six months ago and whose disappearance captured international attention, have prompted people to act. They're also upset at the lack of official action, so thousands of ordinary Mexicans are now organising searches themselves, online.
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