Have you heard of Facebook's EdgeRank? If you intend to use Facebook for marketing purposes you should!
Facebook is still the number one social media platform when it comes to active users. Not utilising this potential for your online marketing efforts could be a big mistake.
To learn more about Facebook's EdgeRank and how it impacts you marketing, read this article: http://www.briansolis.com/2013/01/what-your-business-needs-to-know-about-facebooks-edgerank/