My concern with facebook is avoiding being too spammy with it. I don't want to constantly barge people with "omg look what I just listed!" posts, because I know that can turn people off from checking out your page and keep being your "fan."
What I try to do instead is use facebook as a way to build the personal connection for which a lot of people turn to etsy. For example, I'll have statuses like "It's triple digits outside, and I'm here crocheting hats and scarves. Wow, can't wait for cooler weather!" or if I do share a listing (because I do), I say why I'm excited about it: "I've been working so hard on this design -- it's so great to see how it finally came out! Yes!"
I also keep my photo albums updated with one pic of each item I've listed, and when people comment, then I respond back with the listing url and something else personalized.
Not sure how successful this is, but at least it makes me feel better about not being a spammer. Only problem is I need to figure out how to get potential buyers to "fan" me -- right now it's other etsy sellers and my personal friends. And hey, in case you're interested, here's the page:
http://www.facebook.com/danadooleydesignsHope this helps! I'd be interested in hearing what other people do.