What position is best to use in your Fantasy Football flex slot?

The majority of fantasy football players believe it is best to use a running-back in your flex spot because running-backs traditionally receive the ball (touches) more often than wider receivers or tight-ends.  More touches theoretically means more opportunities to score points.  However, with recent NFL rule changes, stronger and faster wide receivers, and fantasy football scoring systems that provide extra points for catching a pass (catches) wide receivers are scoring significantly more points than running backs on a weekly basis.  Therefore, it is advised to play a wider receiver in your fantasy football flex spot.