You need to be VERY careful about meeting anyone online, craigslist or not. There was a recent murder in New Jersey when a young woman answered a bogus nanny ad in person.

http://newjersey.craigslist.org/kid/462460300.html

I actually met my husband online many years ago so I'm really aware of how many precautions we took when we met on our first "real" date. I think people are pretty smart about that stuff but maybe don't think that something like craigslist could be used by a predator.