Example: You post your referral link (to any Classerium page) on Facebook. 5 of your followers click the link and come to Classerium. 3 of 5 have registered. You’ll see that 3 referrals came from your Facebook page.
Then you write another post with a referral link (any page). 2 more people came through that link and register. You’ll see that 5 referrals came from your Facebook page. And so on.