Users should be able to upload their 360° images and people should be able to easily view them by panning and zooming around them.
Right now there aren't many options online for sharing 360° images that you can also view. One option is Facebook (boo), but Instagram doesn't even support them. This would be a big differentiator.
The viewer should show up in the normal place enlarged photos show. Ideally the player will offer full-screen viewing, so the smaller space won't be a problem.