Facebook Data scientist interview experience

I interviewed for a DS position at FB. My phone screen consisted of one fair straightforward SQL question (I think it required a join and an aggregation), and then one longer analytics scenario. You could think through the products that FB has (FB, Insta, etc) and think about what sorts of decisions have been made at various points (frequency of ads to show, which friends to recommend, which ads to show, etc) and think through what kinds of data would you collect and how you would Analyze it to make the data. What would you collect the data? What metrics exactly would you use? Why are those the best? They might say ok, you do that experiment and your results are ___. What would you conclude? etc.


Questions:

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I accepted offer.

which role please? Analytics? Infra? marketing? Thanks

congrats！！！！
Thanks for sharing
any advices on how to prepare? the phone screen and tech interview?