Website Referral Page

Hey guys,

So i came across this awesome referral style website, eg you sign up to a waitlist and then you get sent an awesome referral page that gives you points off liking, sharing, commenting etc.

Does anyone know how they are made? Keen on making one. Maybe a plugin? *Side note* i can already make wordpress websites.

Skip to 2:30 here- www dot youtube.com /watch?v=EChRfnvj1T8

Thanks!