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Once upon a time you could earn points for referring your family and friends to American Express credit cards if they were ultimately approved for the cards using your referral link (that could be sent to them via Amex if you provided their email address). To the best of my knowledge, this option went away a while back for US customers (over a year ago?), but now seems to have returned at least for the Starwood American Express cards including the Starwood Preferred Guest® Credit Card from American Express and the Starwood Preferred Guest® Business Credit Card from American Express. But, I suggest referring your enemies, not friends to the business version of this deal.
In my inbox tonight was an email instructing me that I could refer friends for one of those two cards and earn 5,000 bonus Starpoints for each approved referral — up to 55,000 Starpoints per calendar year. I don’t have the personal card currently, so couldn’t check the offer for that card. However, the offer I would be referring my “friends” for via the business link would be an inferior 10,000 Starpoints after the first purchase on the card and an additional 10,000 Starpoints after $5,000 in eligible purchases on the Card in the first 6 months. This is worse than the standard offers I have linked above of 10k on first spend and 15k after spending $5,000 in the first six months. In other words, the 5,000 points you would be getting to refer they would be missing out on by having you refer them.
However, thanks to some readers who have the personal link it seems that offer is pointing to the standard total of 25k bonus points, so no one should be losing out if you refer to that link! Also, according to this Flyertalk thread, it looks like an offer for 30,000 total SPG points may be returning. In that case, really don’t use this 20k total offer or any of my links! It’s bedtime around here now, but I’ll update tomorrow if/when more info on the 30k offer is available! Update: That seems to have turned out to be a targeted offer, so up to 25k is still the best public offer.