Hacker News Reader

They announced their beta recently, too. You should sign up with us though!

- API for reporting

- Detailed attribution data for each coversion you generate

- Hacker-friendly documentation

- E-mail alerts to walk you through any problems you run into

- And most of us, campaigns that drive great results

Yup. In fact, it's only being rolled out to Qualified Buyers: http://www.facebook-pmdcenter.com/fbx

PerfectAudience is taking signups, but doesn't have access.

Perfect Audience has access through a qualified partner and is running campaigns right now.