"USA USA:" Sign at Brigham and Women's Hospital rallies American spirit

USA signs at Brigham and Women's Hospital #bostonmarathon pic.twitter.com/Uy4cTzT8gJ

— Jessica Moran (@JessicaMoranTV) April 15, 2013

Yes.

America, the beautiful. The resilient. Stay strong.

"America will not quit. It will not stop running. And the Boston Marathon will not go away." http://t.co/nwtLZ7LepM

— The Week (@TheWeek) April 15, 2013

We will overcome. America is strong. Everybody stay strong. #9/11 #Newtown #BostonMarathon

— Georgie™ (@megangeorges) April 15, 2013

God is still in control, America is still free, and there are still Marines waiting to find out who was behind Boston bombings. Semper Fi

— Nathan Bell (@Bell_USMC) April 15, 2013