Twitter has found the perfect way to commemorate the communal horror of the September 11 attacks.

On the 12th anniversary of 9/11, the hashtag #wherewereyou—possibly a nod to the Alan Jackson song—trended in the U.S. In 140 characters or less, users who were in New York City at the time summed up what they saw, weaving an oral history of that day.

For some, though, 140 characters weren't enough.

Photo via quintanomedia/Flickr. Remix by Fernando Alfonso III