The LinkedIn Node.js library by Julien Valéry aims to provide an object oriented wrapper for the current LinkedIn API. Install, usage, and options are available on the site. On GitHub, the author also shares links to documentations of different APIs that include LinkedIn people, LinkedIn groups, LinkedIn companies, LinkedIn jobs, LinkedIn share, and LinkedIn communications. Under MIT license.
In response to developer feedback, Twitter will soon add semantic versioning to its Ads API so that developers can more easily deal with new and deprecated features. Additionally, Twitter is increasing the time it supports deprecated versions of the Ads API from 30 to 90 days.
If you like online games and you like programming, the growing number of games with open APIs is a boon. We now over 20 games-related APIs in our directory. The latest entry is for the new API for Spore, the Electronic Arts Maxis game where players can create their own creatures. The API provides developers with the capability to create mashups and applications that access the Spore database of user creations and information about the creators themselves (see our new Spore API profile for details).