Can you generate enough traffic to make it worth your while in terms of sales? Look over what Starbucks did with Facebook as reported in The Election, Starbucks and Social Media Marketing by DrakeCooper 

“Starbucks set up a straightforward Facebook event that looks to be created and administrated by someone inside the company. I am betting this is about an hour investment of their time – max. And…they have garnered 423,792 invitations from people on Facebook just forwarding it around to their friends. Also, 164,883 people have said they will attend with most of the rest still awaiting response. There is also 13,187 wall posts and tons of pictures, etc. That is pretty heavy duty work for a social media campaign - driving a ton of traffic to them on FB – which also has other things for people to do, like see the commercial, participate in the “My Starbucks Idea” section and more. I would love to see their web stats today. If you are on Facebook check it out here. ”

You can read the whole article at http://www.drakecooper.com/news/2008/11/electiion-starbucks-and-social-media.html