Classified Websites for SEO?

Marketing
1

Hey Guys,

I could read on some websites that free classified websites can help to improve our serp positions. But i think such sites offer nofollow links. Then how this be possible? Do you have any idea/experience on this? Please feel free to share your experience.

Thanks

2

Don’t the people at “SEO Services” in your signature link know?

3

for traffic may be, not much for seo.
classified ads expire after x days.