Just two hours after cartons of cigarettes were stolen during a burglary at the Woodman’s gas station in Janesville, they were offered for sale on Facebook.  That’s how police tracked down a suspect and arrested him Tuesday.  Investigators were looking for the person who broke into Woodman’s and a Janesville Walgreens.  Twenty-one-year-old Mason Galvan posted the cigarettes for sale on the Janesville Swapmeet Facebook page.  When officers went to his home, near the Walgreens, Galvan was outside, wearing clothing which matched what was seen on video surveillance.  He was arrested and is being held in the Rock County Jail.