The mothers of Mexico’s missing use social media to search for mass graves

“Attention Jalisco. Do you know the location of a clandestine grave of corpses?” The question, aimed at people in the populous Mexican state, was posed on Twitter in February by Madres Buscadoras de Sonora, an organization of mothers searching for their missing loved ones. Dozens of people responded. Neighbors who had witnessed clandestine burials came…