It's good to note that for existing cardmembers who opened between October 2016 and May 2017, you'll have the 50 % rebate with no cap until the end of your membership year, but you'll still have to wait 6 - 8 weeks for the rebate to post. (travelcodex.com)
For example, American Express will let existing cardmembers refer people to the Starwood Preferred Guest credit cards and earn 5,000 bonus Starpoints for each successful referral (log into your account and look for an ad in the lower right corner). (travelcodex.com)
I was poking around the interwebs this weekend and found a new site, Referaound, that shares information on referral programs.For example, American Express will let existing cardmembers refer... [Read more...] about Earn Miles and Discounts for Referring Friends (travelcodex.com)