Talking about facebook promotion (not advertising with fb) , there are two powerful tools i would like to mention which may help you to find referrals in the right area and would cover maximum members interest in a correct manner .
1. the use of the 'search box
use the search box to find various pages which shares common interest between people on how to earn money on the internet. just type the tags such as 'earn money' , 'how to earn' and find various results there. while posting your referral link, give a few bright words about clixsense and also a copy of your payment proof. it really works & not to forget don't spam.
use the same search box to search for groups about earning money online. i'm sure you can find some friends interested in there. also you deeper downline grows with this technique .
As i said before and as everyone know's fb is a 800 million user resource so you will always find your own strategies and techniques soon .
Good luck !