Recently i have found that people around have lot of facebook pages but they do not know how to monetize it. Most easy and effective way to monetize through facebook pages is to use facebook viral apps and viral games. Since they are viral they give you extra likes and money. If you are PHP developer then you can develop them. New concept apps generally gets higher traffic and higher money.
Use lifestreetmedia.com for you ads.
People who have pages but cannot make apps, they can buy one from forums or other websites. If you want some free app you can also add me here.(Send me req cause i cannot pm you since i am new here.)
If anything is unclear you people are free to contact me.