As Social Network owner, you always think of how to maximize monetizing and here it is the plugin for that target:
Increase your revenue and maximize the value from your website’s visitors by introducing your subscribers and visitors to the Affiliate system. This system conveniently assists you to enhance your user shopping satisfaction within a site by letting the buyer get his desired items, the seller earn a profit through the sales, and even better an affiliate is rewarded for every subscribers or customers provided through his efforts. It is a perfect tool for you to track the referrals to your website as well as their deposits spent on your site. This is facilitated by the use of a unique tracking URL which is derived from text links on your website.
Fore more detail, please see at: http://socialengine.modules2buy.com/affiliate-system.html