Quote:
Originally Posted by earn-2.com
Hi,
No one visits your free classified add,but a back link may be useful.

happy ads
Link back are useful provided it is

1. Relevant link
2. Link with some backlinks to the page you are getting the link
3. Less outgoing links

And in the above link farms none is satisfied.

Also in fact having links can get you punishment as google says it in there FAQ