There's a headline out there that says FB is in negotiations with 6 major news sources to 'host' their content so users won't have to leave their ecosystem.  Someone asked "what happens to our ad revenue?"  

http://www.engadget.com/2015/03/24/facebook-hosted-news-content/

Sounds like they'll be putting ads on it, so you'd need to shell out more to be covered in both the native site and FB?

update:

"Facebook will reportedly earn nothing from ad sales, and instead offer publishers 100 percent of revenue from ads sold via Facebook-hosted pages in exchange for more time spent on its network."

http://thenextweb.com/facebook/2015/05/04/report-facebook-to-start-hosting-other-sites-content-this-month/