One way would be to congratulate your affiliates on Facebook for their accomplishments on SFI. This can also generate interest from people who aren't members of SFI. Have open discussions with them about the benefits of SFI and you will get more referrals too. Social media can be one of the best sources of traffic for your SFI and TripleClicks gateways. AND a great way to remain in contact with your affiliates and provide motivation for them.