Your business Facebook page is part of your business branding and marketing and should link in with your other on-line business marketing.
Twitter is a great way to engage with both existing and new customers and bring together your other on-line marketing.
LInkedIn gives your business the ability to link with companies, individuals that can enhance your business.
Google + is ideal to help boost your business profile within the Google search mechanism.
Create a business chanel for your business and become part of the second largest internet search engine.
Pinterest is a great place to promote business products with great images that can picked up.