MEDELLÍN, COLOMBIA — The posts began to pop up in Mym Hernandez’s Facebook and WhatsApp groups in November 2018. “PERDIDA,” they read. “LOST.” Next to the word was the smiling face of her friend, Ilama, from Hernandez’s home in Venezuela. Just earlier that month Hernandez, a 29-year-old Venezuelan migrant in Colombia, had seen that face in […]