When it comes to Instagram, there's been some serious controversy over ownership rights and Terms of Service. You can take the photos with the app, edit them in the app, host them on the app's servers, and ultimately sign over certain rights to the app. Not everybody likes this arrangement.
Pressgram is creator John Saddington's solution to the problem. It's an Instagram alternative that allows you to host your images using WordPress (either .org or .com) and retain 100 percent ownership rights.