Getting referrals is another great way to make some more money. These sites pay you a percentage of what your referrals make and you can also receive bonuses pertaining to your referrals. Each sites bonuses are set up differently.
There are many ways to get referrals. First, add your referral links to your signature emails. Second, start a blog, there are many that you can sign up for free. Third, add a bit of information about your sites on your profiles. Fourth, you can tell your friends and family
It is free and has some more great tips to help you.