Prohibition Homebrew is an e-commerce site specializing in homebrewing supplies, ingredients, etc. They're doing some smart stuff through Facebook Connect to cultivate a community of homebrewers.
From their site:
Prohibition Homebrew is the world's first fully integrated online community where homebrewers can share their recipes as well as track and document each batch of beer throughout the brewing process. Users can share photos, videos, equipment recommendations, and shop for necessary items in the online store. Each Speakeasy Community member can record and store data on every batch of beer they brew in order to improve and perfect their recipes.
Spread the word to your brewmaster friends!