Here are some articles I’ve come across recently that I’ve found useful. At the bottom of the page there are links to previous social media reading lists, too.
Introducing the Tweet Activity Dashboard (Twitter)
News Feed FYI: A Window Into News Feed (Facebook)
FB Newswire, A New Tool for Journalists (Beyond Bylines)
Best Practices for Journalists on Facebook (Facebook)
Understanding the Knowledge Graph (Kahena Digital Marketing)
How to Create Google+ Hangouts On Air: A Step-by-Step Guide (Onlinevideo.net)