During undergrad, I worked on a few side projects, with most of them using some sort of social-networking API. It was great learning some new skills and at the same time it was rewarding to tap into the vast networks of established sites such as Facebook and Twitter. Cue to postgrad and I had to complete a research component as part of my course requirements. With a nudge from my supervisor I asked the question: "Is it viable to have a generic social networking API? Will it be useful?"
Popular social check-in service Foursquare is going through some changes, and the most important of those is that the old v1 API is going dead, as we've known since March. Older apps, especially abandoned ones, will stop working then, as will any newer app that hasn't yet upgraded to the new API.