Well this feature is a bit outdated imo ( If you take a look at the banner design)
At those days, you could register, and when you register, you can fill in a name of a referraller (wth word), and he gets 100tc, when you sign up, but then people farmed, and they stopped with this.
So its just a banner, and in my opinion they dont give you anything, because elseway nobody would use onlinks, everyone would use these to get 100tc per click ;)
Hope i helped.