If Instagram existed in Middle Earth, Thorin Oakenshield would post a lot of pictures of Erebor just so people would come and visit. He would also do Happy Birthday shoutouts to his closest friends like Bilbo, Dwalin and Balin with a few other exceptions.
He would boast abut Fili and Kili and post often about Frerin. He wouldn’t have a bio because all you need to know is that he is the king. He would have a lot of followers, but would only follow the members of his company and Dain and Dis. He usually posts a picture during breaks but only the picture, no caption unless its the birthday thing.
He would troll Thranduil’s posts and always drag Bard into it. It happened so much that Bard was tempted to block him, but because of new treaties, he didn’t. All in all, Thorin secretly obsesses over instagram and constantly looks at #cutekitties tag.