Runners are hitting the road in support of Boston bombing victims . Run : I 'm pledging to run a marathon by Tuesday ; join me . Sign up for the Facebook iReport challenge : Run for Boston 2014 . Run says the runforboston hashtag led to the challenge .
Runners are hitting the road in support of Boston bombing victims . John Sutter : I 'm pledging to run a marathon by April 2014 ; join me . Sign up for the CNN iReport challenge : Run for Boston 2014 . Sutter says the # runforboston hashtag led to the challenge .