asp.net web portal only from indonasia Brazil iran turkey

Hi developers, we need a portal like http://ad.isonline.in. this ad portal contains 7.2 million pages now. we need same portal where user can register itself and make post as author. portal is not such big issue but be need and post content is not actual in this [login to view URL] portal. these are Reapeting after each 10 post.. you can check. this is a portal where spammers or seo expertes can make spamming or anybody can advertise their business. plese dont bid without proper understanding of the demo site... demo link is http://ad.isonline.in. welcome for your suggestions. Thanks