some crazy facts
* Facebook serves 570 billion page views per month (according to Google Ad Planner).
* There are more photos on Facebook than all other photo sites combined (including sites like Flickr).
* More than 3 billion photos are uploaded every month.
* Facebook?s systems serve 1.2 million photos per second. This doesn?t include the images served by Facebook?s CDN.
* More than 25 billion pieces of content (status updates, comments, etc) are shared every month.
* Facebook has more than 30,000 servers (and this number is from last year!)
from a good article on what drives facebook