Good copywriting and get involved with the community. Also the product that you are selling should be useful to the category. I am not too sure if Craigslist allows digital product.
Free Classifieds are always a good way to get traffic. It is about the copywriting and following the Classifieds site rules.
Ive had luck with this without getting flagged. I say that I am looking for local models for my site, give the url, and viola... traffic.
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Get a product called Craigslist Marketer Pro. It comes with a guide, video and spreadsheet. It tells you how to use Craigslist effectively without getting flagged or deleted.
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Craigs is getting tougher and tougher. Even legit ads get ghosted or flagged. As one guy said at a different forum, it's amazing that there are people out there who have nothing better to do than browse around cl and flag posts.