On Dec. 14, Jackie Hegarty of Newtown, Connecticut, knows her phone will be "flooded" with messages, as it is each year on that day, the anniversary of the Sandy Hook Elementary School mass shooting. Hegarty, a Sandy Hook survivor, lost 20 young classmates and six educators in that shooting, which marks its somber 10th remembrance this year. This year, Hegarty said many of the messages she receives will be from people who weren't there that day with her, but who know exactly how it feels to survive a school shooting.