- User Story: As an unauthenticated user, I can log in with GitHub.
- User Story: As an authenticated user, I can link to images.
- User Story: As an authenticated user, I can delete images that I've linked to.
- User Story: As an authenticated user, I can see a Pinterest-style wall of all the images I've linked to.
- User Story: As an unauthenticated user, I can browse other users' walls of images.
- User Story: As an authenticated user, if I upload an image with a broken link, it will be replaced by a placeholder image.