This article was posted last year in September on http://www.insidermusicbusiness.com.  It provides a great diagram for social networking.  The focus is for musicians but its uses are unlimited.  Check out their Basic Multimedia Strategy.
Social Media Strategy For Musicians – Facebook, Myspace, YouTube & More | Insider Music Business.

We have made a massive overhaul on the website this week. Previously we relied on the flash page created by the very talented Nick Terry. The main issue was updating the site and keeping up with all the crazy applications available today. I hope you find this new layout as functional as [...]