the only thing that comes to my mind is: they have a bigger user base - so they have economies of scale.
And that scale is impressive. FB is worth a lot, no doubt about it. But $50 billion seems a touch on the high side. By, maybe, $45 billion.
I might eat my words if Facebook is the recipient of "Brand" marketing dollars of which there are billions
Skibum, from what I know about branding, I cannot see that. Unless we get Facebook Video. Then, maybe.
What is Facebook Video? It's an idea worth billions of dollars. I just came up with it. It's a great idea. I wish I could tell you what it is. I mean to say, I really, really do wish I could tell you what Facebook Video is.