I worked at Facebook last year and Google this year. I don't have an insider view of the other companies but some of my closest friends work at all of them except Netflix. My guess is that none of these will stop growing in the next few years, but Facebook is especially undervalued. They execute on new products faster and better than the others listed, so regardless of current sentiment they are probably not going to…
What are Facebook products? And which ones are worthwhile? The only thing I could think of without cheating and using Google is the Oculus line. I'm not personally convinced there's a huge VR market, but there could be, and Facebook probably has the best product for this market. They aren't competing against the other megacorps listed in that particular market though, so I can't evaluate if they execute faster/better…
I don't find it a very good definition. Implementing a feature is not a new product.