ATLANTA — The Atlanta Falcons released wide receiver Harry Douglas, starting offensive guard Justin Blalock and defensive end Jonathan Massaquoi on Friday, a day after cutting running back Steven Jackson. Douglas, a third-round pick in 2008, had career-high totals of 85 receptions for 1,067 yards in 2013, when he started in 11 of 16 games. Douglas, a third-round draft pick from Louisville in 2008, usually was the No.