http://www.metalinq.com/social/ serves retailers, by helping identify vendors that provide solutions to online retailers that fall under the social commerce umbrella.
Because social commerce is a broad topic and making sense of vendor offerings can sometimes be difficult, the authors have attempted to categorize the various vendor products into a clear set of solution categories. Each category has a concise definition at the bottom of this page. The authors hope that developing a common vocabulary will benefit both the vendors and the retailers.
A brilliant resource, with huge potential.