Do Free Classified Ads Work? If so, which ones are the most affective..besides Craigslist?

I live in Minnesota. I own a modeling and talent business and I would like to advertise it in many places as my wife and I are looking for new people that want to get started in the modeling and talent industry. Thank you :)

I don't believe successful high volume business bother with those free ads, they have identified customer acquisition costs that are still profitable in the long run.

Effective I don't know, but Backpages.com might be your second choice, might have about 1/5 the traffic of Craigslist.

The modeling biz doesn't have the best reputation, anonymous looking classified ads might not inspire trust.