For three years it has chronicled Mexico's drug war with graphic images and shocking stories that few others dare show, drawing millions of readers, acclaim, denunciations – and speculation about its author's identity. Blog del Narco, an internet sensation dubbed a "front-row seat" to Mexico's agony over drugs, has become a must-read for authorities, drug gangs and ordinary people because it lays bare, day after day, the horrific violence censored by the mainstream media.