bulk posting to craigslist

I am working on a website and would like to give users the ability to post to craigslist from the site. Is anyone familiar with the bulk posting api? Or would there be a way to post a form to craigslist and just have my users sign in on craigslists site in order to post their listing there? How should I go about allowing users to post to craigslist from the site?

Are you gonna have tight control over these postings? I can see where this could go out of control and you lose your CL account.