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Iirc the story was fb messenger was written in Erlang, then they rewrote in c++ because of no trust in erlang (I think that was around when fb messenger started sucking with everyone complaining about bugs -- it was better last I used it 4 yrs ago) then ironically they re-acquired Erlang via WhatsApp.

I wonder if they will make that mistake twice

I think Sigma (FB's spam filtering system) is still written in Haskell, but I may be wrong (basing this around internet rumours since I don't work at Meta).

> Haskell because elitism.

Does anyone know if Simon Marlow is still at Meta and what he works on?

Glean, at least tangentially?