Hello,

I am a co-author for a business forum. We have lots of novice members who, some day wants to become an entrepreneur. So we do get lots discussion on basics of business.

For some time now, we were thinking of running free online advertising platform, where these novice members can come and post adds of their business or products or some thing that they wish to offer as service. So we are looking for a good open source script which do the following

- PHP
- User registration
- user add management option
- a good admin controls to block spams or sex oriented adds
- Very good SEO, because its going to be free service so we dont have money for promoting this web service.

Any help will be appreciated.

Thank you