Never have used Facebook to try to pick up business. There was a fella on here a good year or so ago, fancied himself as a web based marketing guru, spouting how Facebook was the next big marketing tool. Which we all know is never going to happen. At best Facebook is a comic.
We do have a Facebook page, it isnt for marketing, its an SEO tool, a web presence, for Google and other search engines to associate with the business. This'll help with maintaining or improving SERPs.