This has been around for a little while, just never got around to posting it. Chase has a referral program for both the Freedom and Sapphire cards where you can get 5,000 bonus points for every card referred, up to 50,000 bonus points.
You can send the referrals via Twitter, Facebook or email.
You have to make a referral by January 31, 2014.
You get the points as long as the person who you refer uses the card before May 31, 2014.
This is offer won’t work for everyone. Officially only select card-members are eligible for this program, though many people that tried have had luck.