As a user I've pretty much turned my back to Facebook, but boy must it be interesting to work at that scale. Here's how Facebook built their mobile device lab.

... We needed to be able to run tests on more than 2,000 mobile devices to account for all the combinations of device hardware, operating systems, and network connections that people use to connect on Facebook. Today, in our Prineville data center, we have a mobile device lab — outfitted with a custom-built rack — that allows us to run tests on thousands of phones. The process of building a lab in our data center wasn't a direct path, and we learned a lot along the way...

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