GREENFIELD, WI (WTAQ) - Facebook postings could wind up sending a 17 year old Greenfield boy to prison for four years. Justin Cervera could also have to pay $11,000in fines. He’s facing drug possession charges after a friend wrote on his Facebook page that he needed some drugs. Cervera wrote back, telling the friend to call him – but, a Greenfield police officer saw the postings. The cop later caught Cervera will a prescription bottle of drugs. The suspect could do the prison time, if he is convicted.