they just raised a round on 1.5B valuation. Just exactly how much money you think Amazon or Google would be willing to spend on this deal? I would assume that if they just raised that round, the would not talk about anything less than 10X.
I don't think neither Amazon nor Google would pay 15B for a company, regardless how much traffic they are getting. For that amount, and knowing Google, they would rather build their own product.
Why would you assume it would have to be 10x? But I agree with your broader point that it would have to have amazing metrics to support that valuation on purchase. Instagram, from my point of view, was as much as defensive move as anything else - not sure there would be the same driver here.