New Fresh Users Needed for an online service

We have a new website that we want to popolate fastly with new fresh users. We need to find freelancers that , for example, have or own a site or a forum or a mailing list(min >50 users) in programming, webmaster, computers, engineers, software fields. We can pay a fee for make you start to promote our site to your users and after pay the 15% of each new users carried for 1 year. If you wnat it could be a fantastic opportunity! No scripts, no fake users, no fake emails... requieres. We ll pay with escrow.