I have just under 100 FB fans for my business page, and I almost always get a few sales a month directly from a FB promotion ... but I've amassed that list of people rather slowly. For example, I've made a point not to fall into the habit of liking other Etsians just because I want to have a lot of followers and have them like me back. Rather, I've used FB to encourage customer loyalty. Some customers sign up because that's where I'll post news of my next big sale (all of my listings encourage people to follow me if they want to access to special coupon codes). Some of the people there are personal friends, but I also usually post news of sales to my regular FB friends, too; if I just "share" what I've posted on my business page, I like that FB will post both messages together for anyone else who is a friend to both me and my business (somehow feels less "spammy" that way)