And photo captions included heartfelt declarations of love to the city.
"This is my city. The place that I've grown up, and the place that I love," Mackenzie Hobbs said on Instagram.
"Hearing the word 'Chattanooga' makes my heart inevitably skip a beat from joyful pride always. When I heard it on the radio this afternoon, it was obviously very different," Alex Thornton said on Instagram. "I can't help but feel like an old, dear friend is hurting so badly."
"Thank you, Chattanooga, for always being my shelter," Anne Claire Cheatwood said on Instagram. "I hope we can all band together and be that for you this time."