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It depends on customers really, how ever Youtube, Facebook, Twitter, Linkedin, Blogs and websites are some of the preferable media for small businesses.
In no order; Facebook, Twitter, foursquare, Google+, YouTube, Yelp, Instagram.
I have found that if used correctly networks such as reddit can get you a lot of organic business growth. However in public view I'd suggest that stick to twitter, pinterest, and of course facebook.
Know where your customers are - you will find the answere :)
