[kevsim]

I was guessing A was FB due to the one-time mega download (though I've not worked there so I'm not sure if there's a linux VM in that picture)

[saagarjha]

Considering that Rachel has worked there previously, it’s probably not a bad guess.

[keegancsmith]

FB is company D or E. FB you could have a linux laptop though, and could install linux on the mac. Not officially supported, but lots of people installed linux.