The 3 Most Important Revenue Streams for Facebook

1. Text and Display Ads: represents 60% of the company's equity value
Facebook offers both cost per click, for which advertisers pay only when users actually click on the advertisement, and cost per thousand impressions, for which advertisers pay based on the number of times these advertisements are displayed on user pages
2. Credits on Games and Applications: 17%
3. E-commerce: 11%

參考來源： The 3 Most Important Revenue Streams for Facebook - BloggingStocks (在「Google 網頁註解」中檢視)