从fatwallet上看来的，这个回帖有意思：Up it's simple. I just took my friend on in, he signed up and while doing so indicated I was referring him. We both got 10.00 gc's.

And wouldn't you know it, everyone in line behind me started to refer each other... haha

帖子在这里：http://www.fatwallet.com/t/18/568112/