Hello
at the risk of having things thrown at me, I'm amazed at the negativity here about Facebook, Twitter & Linked-In. We have a retail shop and an online business, with online accounting for the vast majority of our sales. By definition therefore, most of our customers are web-savvy and like the internet.
We have a Facebook Business Page (sorry insufficient postings here for real URLs apparently) our web address/facebook, a Twitter profile twitter dot com/littlesunflower or at littlesunflower and I am on Linked-In too. Through these three sites we have found new suppliers and contacts within our industry as well as new customers - some have bought from our site as a direct result of 'talking' with us on Twitter. The response has been amazing, customers have even posted pictures of their children wearing our clothes on our Facebook page and they love being offered 'deals' that no-one else gets.
It's like anything, you can choose whether to spend half your life on these things (not recommended) or whether you spend a few hours a month. Something akin to the time spent at face-to-face networking events, and probably better results per hour spent were we to spend the time working it out.
Once upon a time Blogging was considered a new fad that wouldn't catch on, ditto online forums

and emails. And you could be sure it was the same for telephones, certainly mobile ones. My advice would be don't knock it until you've tried it, you might just be pleasantly surprised.
Bev