Like what's gonna happen if they have a couple of corrupt data? A minor incovenience at worst?
Is anyone gonna lose millions? Nah. Anyone gonna die? Nah. Anyone gonna get sued? Naaaaaah
Also Facebook uses MySQL for their primary data. Pretty sure it's the same for ebay. Don't know about Adobe, I bet it's the same deal there too.
People get so excited when they hear some big company using X, but they have no clue in what capacity it's used. I can guarantee you that all the data that matters, that need to be consistent and whole are in some kind RDBMS.
But no point discussing it with you since you think: Sony Playstation Network, Apple iCloud, Office 365 etc aren't important data to these companies.
There's no point discussing with me, because you can't have a coherent debate. Analytics data are not critical neither primary. You really have to reread what I said.
It's used by eBay, Foursquare, Adobe, Facebook etc.
And NoSQL databases underpin most of the popular websites around today. It's nonsense to assume all of that data isn't valuable.