Should my business be on Instagram?
I see big business there, and that is a given. Large companies with staff and an actual media department have the assets and man/woman power to maintain a good presence everywhere consumers can be found. In the past, Instagram was limited to mobile devices. Now, gramblr.com offers a way to use Instagram from a desktop or laptop.
Celebrities have pushed Instagram to a high level of users and traffic, so it is definitely another place to get an account established and utilize along with the others rather than go on ignored.