EDIT January, 2016: It looks like Chase has caught on and nulled out the social media links for certain credit card products like the Freedom. If you have an old referral link that you’ve saved before, that should work though.
I noticed a bunch of new referral offers in an email from Chase earlier this morning, so I logged into chasereferafriend.com as usual to generate some referral links. However, when I put my information into the site, I sadly couldn’t find the Twitter or Facebook options anymore!