I know they were using Viglink for a while to monetize their affiliate links. Not sure if it's still in place though since there was some backlash regarding it.

I know they were using Viglink for a while to monetize their affiliate links. Not sure if it's still in place though since there was some backlash regarding it. http://news.ycombinator.com/item?id=1309849 http://news.ycombinator.com/item?id=1309849 I believe that's how Cloudflare also monetizes their traffic, with a Viglink-type service.