The Google Plus Java Library allows developers to create Java applications on top of the Google Plus platform. Developers can add the library to their Maven or Gradle projects using the code provided, or they can download the necessary jars as a zip file.
Microsoft has released a suite of tools to integrate its popular Messenger client into your website. Called Messenger Connect, the new API embeds a Windows Live Messenger chat window on your site, which enables visitors to share links, collaborate, or just stay connected to friends.
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?"