Every couple of months Southwest Airlines sends out a targeted offer which asks you to refer your friends to Southwest Rapid Reward Frequent Flyer program to earn free bonus miles. As of yesterday, the offer is back and again it appears to be targeted (meaning you must receive the email from Southwest to refer friends). Under the current offer, each friend that I refer would earn a bonus of 250 points and I would earn 500 points.
This offer is good through September 19, 2015 so if you did not see this offer in your mail box yesterday check your Spam Folders, otherwise you were probably not trageted for this offer as there appears to be no general link. If you would like, you can email me (firstname.lastname@example.org) and I will refer you if you do not have a Southwest Airlines Rapid Reward account.