Almost immediately after the deadly shootings at Virginia Tech University on April 16, Virginia Tech students created an "I'm OK" page on Facebook to let one another and their loved ones know that they survived. Other students posted photos and cell phone videos on their own sites, or shared them just hours after the shootings with news organizations.

Thanks to the portability and speed of today's technology, the students' shots are likely to become some of the "defining images" of the tragedy, says Amanda Lenhart, a senior researcher at the Pew Internet & American Life Project, which monitors high-tech culture.

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