Fiverr is a well-known website which is famous with its 5$ work done sales. You buy any service by just paying 5$. It is one of the biggest websites in internet. Everyday people are selling and buying services via this website.
One of the users of Fiverr has published a service where she shares your links on her facebook page. She just do such a work just for 5$. It worths to try ha.
You can see the service in the following link.