The FamilySearch C# SDK by FamilySearch communicates with the API via NuGet. It provides usage and example available at https://github.com/FamilySearch/gedcomx-csharp/tree/master/FamilySearch.Api#examples
Topsy, a search tool based on real-time social media activity, has unveiled a new service called Topsy Social Analytics that tracks the rise and fall in popularity of specific pieces of online content as well as broader trends in online discussion. The analytics tool, like the Topsy API, uses publicly available data from Twitter to rank content and identify trends.
How far back do your newspaper's online archives go? The U.S. Library of Congress has a database of thousands of newspapers dating back to the 1800s. In the case of over 150 of the papers, there are also digitized, searchable pages. And it's all available via its new Chronicling America API (technical details at our Chronicling America API profile).