The first thing that you can do, is get on Facebook and take pictures of your customers enjoying your product. You can also incentivize this for them by telling them that they can get a discount if they will pose for a picture and or share your business on their own personal Facebook account. When they do "share" your business on their Facebook, all of their friends then get an update that they have shared something.
Below is a link with some cool social media strategies:
The next thing that you can try doing, if you already have a lot of followers is doing a short term special and advertising it on your Facebook. Now, your friends on Facebook can then share the message with their friends in order to take advantage of this limited time offer.
Next, take a look at this video, where a good friend of mine, fellow internet marketer..and...well, social media GENIUS, JODY UNDERHILL gives you some cool ideas about your own social media marketing strategy:
You can also easily share updates and coupons with your followers, friends and family on your Facebook. Remember that since you are an expert in your niche, you can easily provide value to your target audience.
Talk about what makes your business unique on a blog, and then you can post that on your Facebook for people to read about. Don't post a ton of content at one time. Take time to "drip" out the content. If you blast all your content out at one time, your audience will go into overwhelm...by dripping it you give the audience "dispensed learning" where they can easily digest what they have posted.
Here's another great resource if you want to learn more about social media marketing: