Google Vs Facebook: Revenue Per Unique User Compared

http://www.onlinesocialmedia.net/20110105/google-vs-facebook-revenue-per-unique-user-compared/

參考來源：

"Google Vs Facebook: Revenue Per Unique User Compared"
- Google Vs Facebook: Revenue Per Unique User Compared : Online Social Media (在「Google 網頁註解」中檢視)