This is a great social media primer and resource from the guys at Eloqua (www.eloqua.com)
It contains just about everything you need to know about Twitter, Facebook, LinkedIn, YouTube, Wikipedia, Delicious, Flickr, Google Buzz, Foursquare, Gowalla and blogs (10 platforms in total).
Created as a “how to” guide for Eloqua staff to follow on the social web, it is a nice compact summary fitted snugly into an awesomely designed playbook. And best of all, it’s available for free (no forms to complete, no email address submissions. Totally free.)
Download your copy at http://media.eloqua.com/documents/Eloqua_Social_Media_Playbook_Public.pdf