Viral Marketing Campaign

I am in the final stages of building a structured business social networking site. It will be done in less than one week. Latest 11/21/09. It needs to be marketed/advertised to small business owners and/or all people looking sell their services/products. I have done some market testing/research and have had great feedback. I already have a bunch of presign-ups from my own social network. I am looking for a company that has extensive experience in viral marketing. MUST MUST MUST have experience. MUST come with a plan re marketing. Please tell me how you wish to be compensated. The website is membership based for $50 per month. I would be happy to offer an ongoing revenue share/commission based for all sign ups or pay for just marketing. Market research has shown that we can easily obtain thousands of members. I am happy to speak with you either over the phone or via instant messaging. Please be detailed with your experience. I will request references. Companies or people with aggressive team approach will be given preference.