A convicted sex offender is behind bars for allegedly having sex with an underaged girl he met on Facebook.  Twenty-one-year-old Levi Samuela is accused of having sex multiple times with a 13-year-old girl while he was on probation for a previous sex assault conviction.  The girl invited Samuela to her home in March.  He's charged with seven counts of sexual assault.  His bail was set at $250,000.