P&G now advertises over a dozen brands including Tide throughout Facebook - with varying results and feedback; this is corporate paid sponsorship though. Facebook has over 130MM members and recently was adding about 1M new members a week.http://www.nytimes.com/2008/12/14/business/media/14digi.html?pagewanted=1&_r=1&ref=technology
You may or may not be aware of, or a user of Facebook. The Link below to a marketing guru's description of Facebook and how to create the business page will fill you in. Including why it's worth the effort.
I had wondered how effective this would be for a retail like, store front business like a laundromat, with varying aged customers and a very transient customer base coming and going. Then I figured who cares, let's try it out. It's a simple way to get another viral web presence for your store or chain and people in that city's "network" can become fans of your business. Be ready, there are also walls, discussion boards and reviews attached. Best of all it's FREE.
Setting up a Facebook Business Page