whatever your market there is a probably exist specialized social networks dedicated exclusively to you and your customer for instance Ravelry online knitting and crocheting community works wonders for the folks at Yarn.com.
Photographers, artists, designers, fashionistas, and other visual types will want to be active like zazzle, flicker, etsy, cafe press, for travel and tourism we have trip advisor and wayn and other travel communities.
what these networks lack in size, they make up for in focused sense of community—and the halo that your brand may cultivate simply by being an active part of a tighter, more tribal group.
Depending on your market, you may find that your time spent building community on a niche site is far more valuable than building it on the big, mainstream platforms.