People who smuggle migrants across the US-Mexico border, known as coyotes or polleros, are logging on to Facebook to find more clients. Satisfied customers will post reviews of their coyotes on social media, and connect their relatives to helpful smuggling contacts online.People who smuggle migrants across the US-Mexico border, known as coyotes or polleros, are logging on to Facebook to find more clients. Satisfied customers will post reviews of their coyotes on social media, and connect their relatives to helpful smuggling contacts online.