To start I want to say some things about Liodens current referral system, in case some people aren't sure as to how it works.
You have to generate a code, a very complicated code that can be easily mistyped, and that code expires after 7 days or after someone has used that code; to sign up as a referral. Meaning, you have to generate a new code every week or every time you refer someone to . In my opinion, a tad annoying.

Now, I play on quite a few sim websites similar to this site and all have the same idea with referrals, and rewards for getting them. However, these other websites have a lot more simpler method for referring people. To start, they use links such as: http://[WEBSITENAME]?refid=31927 which makes referring so much easier.
Also, by using links you can go on different websites and use clickable images with these links to easily advertise: with the images that are already provided here!

So, I was really hoping that this could be implemented! I don't know a lot about coding but I'm sure this wouldn't be too hard to implement, obviously the coders have a lot on their plate already but I feel like this would be a very good addition to the game!