There&#x27;s a mention of Facebook regularly doing this in the summary section of this instagram engineering post: <a href="http:&#x2F;&#x2F;engineering.instagram.com&#x2F;posts&#x2F;548723638608102&#x2F;" rel="nofollow">http:&#x2F;&#x2F;engineering.instagram.com&#x2F;posts&#x2F;548723638608102&#x2F;</a><p>EDIT: Here&#x27;s more info: <a href="http:&#x2F;&#x2F;www.datacenterknowledge.com&#x2F;archives&#x2F;2014&#x2F;09&#x2F;15&#x2F;facebook-turned-off-entire-data-center-to-test-resiliency&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.datacenterknowledge.com&#x2F;archives&#x2F;2014&#x2F;09&#x2F;15&#x2F;faceb...</a>