have you used Facebook as a part of your marketing strategy?

Two good reads if you want to learn more:

5 Killer Tips for Facebook Ad Ownage | NickyCakes.com
A Killer Facebook Strategy Revealed | NeilsWeb.com

As for me, no, I have not marketed on FB. I prefer to keep FB just for friends who I have actually met and know. I don't want to flood their timelines with stuff that does not interest them.