You can’t click “feeling terror” on Facebook. But victims of Friday night’s Parisian attacks took to social media to let loved ones know they were safe, or for some, under fire. One Facebook member posted descriptions of the massacre inside the Bataclan theater. He was injured, and “they are cutting down everyone, one by one.” Later, he posted thanks for his rescuers. There were also Instagram videos of the wounded and tweets offering homes as safe havens. And as events unfolded, users exposed them to a global audience while documenting history for generations to come.