I do not know if this is intended but I know for a fact my referral link was used to follow a proposal but I did not get any reputation for it. How does it work? Is that a bug? Or is it intended?
You don't get reputation for people following a proposal via your referral link, only if they come back and commit once it enters that phase, and when they follow through on their commitment once it enters beta. (I'm not 100% sure if the referral carries over between the follow and commit phases. Can someone confirm?) Anyways, the only person who gains reputation for people following the proposal is the person who made the proposal. Otherwise, you have to propose question on it and get upvotes on those to gain reputation in that phase.