There is a cool app out called, 'InstaTrack' you can track the amount of hits you get on a certain app. This would be beneficial for business people who would like to track what the general public is interested in. But for those of us who use Instagram they also give you your 'best moments' in a cute little slide show. They take all of your most liked posts and then put it in format that can be uploaded and posted.
This is pretty cool. I was unaware of the app prior to reading this thread. I do have a couple of online shops and do a lot of promotion via social media. Having the feedback from the InstaTrack app could help me determine where to spend my time, and which types of promotions work best with my current audiences. Knowing that could help me better plan my future marketing campaigns.