neuropsych76, I had no spam calls after creating a craigslist account. I wouldn't think that would be a problem, they require a phone number as part of their security to (try to) reduce scammers. It would reflect poorly on the organization to allow those numbers out. I would be sure to never place my number in an ad and always use anonymous email when posting an ad.
I have used craigslist to rid myself of items too bulky to move for graduate school. I suggest placing a disclaimer at the bottom saying "cash only, local pickup only, no trades". I didn't do this for my first ads and received many scam replies and offers to trade for tattoos.