I said: "well, stick in a fork in Nest then." Does that count? https://news.ycombinator.com/item?id=7053838

Yes! As long as you're consistent.

I think its about the fact that very few software companies can simply birth a hardware engineering division like Google. Its arguable that even Google struggles with it at times.

For a software-oriented company such as Facebook and a fairly new one and not the greatest on the balance sheet, its undoubtedly much harder for them to enter the hardware space than Google.