Thirteen years later, we are still healing.
On Thursday morning, NBC News staff cameraman Jim Long, based in Washington, D.C., sent a tweet asking his followers a simple question: "Where Were You?"
Hours later, Long had received hundreds of responses from people all over the world on Twitter, remembering where they were during the Sept. 11 attacks. Long retweeted many of them, noting that everyone has something to say and a story to share, aided now by social media. From a high school senior in history class to people all over the world, the stories are all part of the healing process.
"It's fascinating to me," Long says. "People say never forget, but it's really impossible to forget. I think everybody is still suffering from PTSD from that day. I remember I stood there in the gash of the Pentagon and saw people with flesh burning off of their bodies. It was the very worst day of my life. I got back to our bureau, and I was just emotionally beaten to hell."
Below, some of the responses: