You do highlight a good point, Dan that with Facebook "almost everyone is on it" giving rise to both some (possibly unfounded) hope for new business, as well as other opportunity.

  Again, these social sites (MySpace, FaceBook, LinkedIn, etc...) are good AFTER-MARKET tools to keep your existing customers and clients appraised of you services, of new opportunities, of seminars, and more.  I've used these things for years and concur with lead economists, that a successful model for profit for internet-only businesses still eludes most industries.  You need word of mouth to generate business.  (I've only received one actual business inquiry from YEARS of having social network profiles with many group cmemberships and "friends" on each and every one of these sites.) 

  My advices remains:  don't waste time and effort creating the perfect social profile in a futile hope of attracting new business, as you'll only get a "good job" and a couple of "meh's" out of it. 

  DO create social profiles to keep your existing clients, customers, staff, and contractors advised of news, ideas and opportunities.  Even posting a seasonal recipe or money-saving idea for the home can be a welcome and friendly message to those you know and serve.  Remember that some of your best customers are returning customers and your best advertising is word of mouth.  From these sources I've received most all of my business.