Yahoo offers an SDK in Objective C language to integrate social features in iPhone devices. Because some users prefer a portable device, this kit can help to create applications to connect using directories and lists of contacts. Requirements include Xcode development tools, OS X 10.5 (Leopard) or higher, and iPhone Sample Code. iPhone OS 2.0+ is optional. To develop, users can obtain a new client-based application ID and OAuth consumer key and secret. They can also access the sample code available on GitHub. The social directory part of the SDK contains 2 APIs and enables applications to include user profiles, interests, contact info, age, gender, location, and photo. Accessing the contacts API, projects can encompass features of social relationships between Yahoo Mail, Yahoo Messenger, Yahoo Mobile, and third party applications.
Sure, you and 20 million of your closest friends are using foursquare. But how useful is it? UK-based Lanyrd, "the social conference directory," recently launched foursquare integration which aims to reward you with more than just points for checking into an event venue. Named after "the thing you wear around your neck at some conferences," Lanyrd offers a user-generated directory of different events, such as technology trade shows, hackathons, and unconferences like BarCamp. Now you can connect Lanyrd to your foursquare account and, after you check in at an event venue, jump over to the Lanyrd mobile app or web site to see more event information.
The Votizen API aims to get friends to involve their friends in supporting candidates. The API website notes that the API is entirely based on HTTP. Votizen is based on the premise that, "Voters are more likely to listen to friends than campaign volunteers." Votizen is the first "social campaigning platform built entirely on personal connections."