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Re:Update on 1/28 service outage by paultela on Friday January 29, 2016 @12:24PM (#10996683)
There's a mention of Facebook regularly doing this in the summary section of this instagram engineering post: http://engineering.instagram.com/posts/548723638608102/

EDIT: Here's more info: http://www.datacenterknowledge.com/archives/2014/09/15/faceb...

Re:Update on 1/28 service outage by why-el on Friday January 29, 2016 @01:45PM (#10997438)
Awesome, thank you. :)