Millions of people have used the popular forum, including at least one killer
Editor’s Note: This story has been updated. In October 2007, Katherine Olson was looking for work. Since graduating summa cum laude from St. Olaf College with a dual degree in theater and Hispanic studies, she’d mostly cobbled together part-time jobs — waitressing, teaching Spanish, coaching high-school speech. Olson was looking at nanny listings on craigslist.org when she came across an…