Pingdom: Software behind facebook
Pingdom has an interesting post which lists the various components which runs facebook. â€œ Exploring the software behind Facebook, the worldâ€™s largest site â€ Few interesting statistics listed 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. Facebookâ€™s systems serve 1.2 million photos per second . This doesnâ€™t include the images served by Facebookâ€™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!) Iâ€™m not sure facebook is really the â€œlargest siteâ€ based on servers alone, but its definitely the largest based on unique users in US.