What is the best way to bring site owners to drive traffic to a niche social network site? I thought of doing an affiliate program with pay per sign up but i figured it might be difficult to keep track of bots and also fake sign ups.

Calculating the lifetime value of a customer would also be difficult since it's hard to keep track of the lifetime pageviews generated by a typical customer that comes through a particular keyword. Any one knows of any software that can track the total lifetime pageviews of a customer from a certain keyword? if so , please sticky me. We intend to monetise via advertising by CPM.

What would you guys suggest in order to bring these site owners on board?

Thanks.