It was not for social media at all. It was for panoramic landscapes. When a photographer shoots a pano landscape the camera is best turn to an upright or vertical position and then the numerous shots are taken. This gives a larger image with less distortion of the sides of each taken image, compared to doing the same thing with the camera left at its normal (View/landscape) position.
Each overlapped image edge is closer to the previous image in an upright position compared to a landscape/view position, which makes stitching multiple images a lot less work and matches each image to the next a lot better. It is a very nice feature to have on a drone for a landscape photographer. I miss having that function on my M2Pro which my old original Mavic Pro did have.