In 2011, we learned that even our cars and trucks were going "social" when Salesforce.com announced its partnership with Toyota. However, the social capabilities of the partnership were limited in scope (car diagnostics, tune up reminders, etc.). What if your car could prevent you from driving a certain route because it knew what areas were traffic-heavy? That car sounds "social" in a fuller sense; it might be possible with the new Beat the Traffic API.
With Instagram's new App update, the "find your friends" on Twitter is very obviously missing. This is due to restrictions from Twitter's side, and seems to be a snub in Instagram's direction as many apps like Foursquare still have access to this part of the API.
Messaging just got a lot more interesting to look at. Words say a lot, but a picture is worth a thousand of them; imagine the levels of communication that could be achieved using both. Doodle Republic is a messaging platform that provides the tools to create messages that include words and images. Basically, people chat by creating their own art and sending it to friends as a Chatoon. The Doodle Republic Chatoon API makes this functionality available to developers who may want to include it in other applications.