In September 2018, I applied for an internship at FB. I got the interview but I bombed it.
It all ended up working out great for me in the end tho...
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Your current job seems to be meaningful to you, honestly it's probably better than working at Facebook where the tech is probably cool but it's still fundamentally wasteful IMHO that smart, skilled, hard-working people who could work anywhere spend their time helping the world to waste even more time on the internet so that Facebook can sell more ads.