Here we go again, ffs
Expect lots of loaded questions shot at you quickly one after the other. Study the Facebook values and use the STAR method when responding.
I prefer the Conjoined Triangles of Success method.
https://www.rooftopslushie.com/request/Facebook-EMEngineering-Manager-Onsite-Interview-109
Look at STARs every night whole night
You will get good at looking star patterns