Image-makers in the 21st century are no longer the professional media, but every citizen with internet access. Personal footage of the 2004 Indian Ocean tsunami tells its tragic story to the world. Young Americans inspired to start a free video sharing site then launch a new era in image distribution. The U.S. recognizes same-sex marriage after supporters mobilize with the help of online videos. Shared images of Tunisian struggle embolden others and help give rise to the Arab Spring. Watch famous and rare images that can tear us apart, and bring us together.