craigslist.com is a highly spammed site. Partially due to its success. From my experience, every post I make get a few scam emails from africa, trying to rip me off...
Recently, however, I have seen new type of marketing scam. This is how it goes: someone posts an ad in the free stuff section, in my case it was "hot tub" that they are offering for free to pick up. As soon as you send them an email, you get a response that somebody else has already asked for the item, so you are second in line. In few hours you get another email saying that the tub is now gone, but here some product info that you can buy: nice spam marketing email.
When this happened to me second time, I knew this was a pattern. Guessing from the type of english, this person was actually local.