Yesterday, WhitePages.com announced a new search API that gives developers access to a substantial database of 180 million people, which represents approximately 80% of US adult population and includes 25 million "at work listings".
At its annual F8 developer conference, Facebook yesterday announced the launch of Graph API 3.0 as well as enhanced developer app review. The third version of the company's Graph API contain a number of changes to Facebook Login and the /comments edge and what data is returned.
A project of the Elgg Foundation, Elgg is a free open source social networking engine licensed to users under the GNU Public License v2. The REST Elgg API allows developers to integrate Elgg and offer new apps for it. To give a sense of its size, 1,646 plugins have been created so far by the user community, with nearly 3 million downloads. Examples of plugins include blogs, forums, social bookmarks.