Im not sure if there is a link or not. But here is what I think.. Why not go ahead and use it? Its free marketing! it may be harder to start if you are new to facebook, however if you already have an account, go ahead and add a page to it, then you are able to invite all of your existing friends to like your page. Do not make a facebook account for your business, facebook requires you to make a "page" instead. You can link up with other local business owners, and it also provides baclinks to your website, which will in turn help boost your ALEXA rankings(whats makes your site appear higher on google).. Cant hurt!