Exploring the software behind Facebook, the world’s largest site Facebook’s scaling challenge Before we get into the details, here are a few factoids to give you an idea of the scaling challenge that Facebook has to deal with: 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!) Software that helps Facebook scale In some ways Facebook is still a LAMP site (kind of), but it has had to change and extend its operation to incorporate a lot of other elements and services, and modify the approach to exis
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