The Nutshell Python SDK by Emil Stenström allows API interaction and provides JSON-RPC protocol. Resources explain how to create an API key and a username to make calls. Documentation available at https://www.nutshell.com/api/detail/class_core.html
It's no secret that Facebook's Graph API and widgets have contributed a great to Facebook's success and never-ending permeation of the web as we know it. Looking to make a similar move, LinkedIn has recently expanded its own developer platform and LinkedIn API. The new LinkedIn tools aren't just aimed at developers. With just a couple lines of code, you can begin integrating LinkedIn in to your web page with a variety of plugins and widgets.