PORT ORCHARD, WA -- Authorities say that a 28-year-old man suspected of robbing a woman at a Washington ferry terminal friended her on Facebook the next day.The Kitsap Sun reports Saturday that Riley Allen Mullins was charged Friday in Kitsap District Court with second-degree robbery.Authorities say a woman was sitting at the Bremerton ferry terminal on Tuesday using her headphones when she was struck on the head from behind. After being struck, a man grabbed her iPod and purse and ran. She didn't recognize the man but noticed a tattoo of a triangle on his neck.The next day, the woman received a Facebook friend notification and recognized the sender as the man who robbed her.Investigators confirmed the Facebook account belonged to Mullins, and they noted a profile picture of Mullins showing the triangle neck tattoo.