I was thinking of retrieving a user's Instagram news feed, however the Instagram API doesn't allow you to do that because some users may be private. However, what if I just used an HTTP connection and logged in as the user then went to the user's 'home' page to get their news feed? I think this would work, but I'm not sure about the legalities behind doing so.
See their Terms of Use. Specifically...
We prohibit crawling, scraping, caching or otherwise accessing any content on the Service via automated means, including but not limited to, user profiles and photos (except as may be the result of standard search engine protocols or technologies used by a search engine with Instagram's express consent).