This is an addon for Powerful Exchange System -> http://codecanyon.net/item/powerful-exchange-system/533068
With this Addon, your users will be subtracted coins with websites and use their to exchange click other links.
Addon for PES v.1.4 includes “coins subtract” for facebook,google,twitter,youtube,auto-surf.
Addon for PES v.2.0 includes “coins subtract” for facebook,google,twitter,youtube,digg,auto-surf.
Give your users more options