I don't think I am, if we're forced to choose between "Evils" then I will choose the "evil" more aligned with my best interests. You didn't originally ask which of those companies was more virtuous merely why one would choose Google over Facebook, I would choose Google because its core business model revolves around helping me, Facebooks core business model revolves around entertaining me.

Not that I think either company is actually evil obviously.

I was thinking of evil and virtuous as bring antonymous I guess.

i.e. I might choose evil that offers me value if I thought the trade off was worthwhile.