Social networks were filled with conversations, with celebrities like LeBron James and Paula Abdul offering sympathy to victims.

NPR: On Screens, Familiar Images Of Terror Flash

Others include James Lloyd, Paula Rego and the late Sarah Raphael.

ECONOMIST: Art

The app contains work by 14 photographers including Adam Dean, Dominic Nahr, James Whitlow Delano and Paula Bronstein, each of whom has added written comments and a spoken message alongside their photographs.

BBC: iPhone photo app aims at relief effort