When you are an active business, one thing to keep in mind are the business reviews that customers leave for you. These reviews are great when you are sharing information. For example, you can monitor the reviews that are being left for you at Google, Yahoo, Manta, Insider Pages or City Search (to name a few) with the use of any of the several review monitoring tools.
Then, when you see that a new customer review has been posted, you can comment it on Twitter or use it on Facebook so that our fan base will get to know you. Furthermore, you can also make a note on your business blog so that your potential customers will know more about your business on mutual third party sites.
Still, this is an interesting piece.