The Zimbra Social .NET SDK by Rudy Sandoval is a .NET implementation. It uses the OAuth authorization type. The Zimbra REST API is a social platform with capabilities such as calendars, messaging, and social networking.
At YourTrove, a lot of what we do involves ingesting social content via APIs and then regularizing that data within our system. For a lot of data, this is pretty straightforward. For example, while Facebook and Flickr might return different meta data, or name fields differently, no one disagrees that a photo is a photo. This is true for essentially all uploaded binary user generated content.
Businesses are taking advantage of the ubiquity of mobile devices and SMS. This tutorial describes how to send an SMS message to a phone with PHP using the Twilio API. Twilio provides numerous communications services, including the ability to make and receive phone calls through the browser, mobile or desktop, send and receive SMS and MMS messages, and handle short codes.