MailChimp has added Facebook Campaign Management! Post FB Ads through MailChimp at the same price, but with added tools and data.
“Today, we’re beginning our rollout of Facebook Ad Campaigns to help our users reach new customers and engage with current ones. Whether your goal is to grow your audience or sell more stuff (or both), you can now do it in the same place you do all of your email marketing. And with MailChimp’s reporting, you can find out which ads generate the most new customers and revenue.”