Online scheme victimized dozens of girls globally, prosecutors sayMINNEAPOLIS — A Winona, Minn., man has been charged with using social media apps to sexually extort dozens of primarily preteen girls across the country and abroad. Valentin Silva Quintana, 30, was charged Wednesday in U.S. District Court in Minneapolis with 12 counts of production of child pornography, and one count each of distribution of child pornography and possession of child pornography. “Online predators are using social media apps to befriend, coerce, and ultimately extort children and teens,” U.S. Attorney Andrew Luger…