There are reports elsewhere that they are calling numbers not ever connected with Craig's List, so they are probably harvesting from multiple sources.
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Recent comments:
21
Oct 4, 2010
This number called me and I answered. There was a high pitched noise and I yanked it from my ear and hung up. I think it's damaged my ear a bit, but hopefully not permanently. It hurts and I couldn't hear out of it for a little while after the call.
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22
Oct 9, 2010
this stupid [***] called me like 5 min after i posted on craigslist so i answered he offered and i told him no but i have a condo in hawaii im trying to sell would he be interested he got pist and hunt up haha..
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23
Nov 16, 2010
I got a call from this number and told them I wasn't interested and hung up. The phone rang immediately upon my hang up and it was them again. My husband answered and told them we weren't interested and hung up. The phone immediately rang again. I just answered and told them to stop calling. No calls after that. (At least for tonight)
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24
May 6, 2011
I told them to stop calling, the lady called back and said "I just did" and hung up!
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25
Feb 4, 2012
Received call from 202-243-7448 and Caller ID showed SCF. Didn't answer, no message left.