On this page, I am sharing links on Facebook.com like tutorials, help, earning money, advertising/promotions/affiliations, etc.
It is depending on the country. For example, if you are from India and want to give a standard ad so you have to pay around Rs. 80/- (approximately) which is a starting price.
How to earn money on Facebook?
A lot of ways you can use to earn money on Facebook including gaming, instant article, story, Facebook ads, affiliate/referrals, and videos.