...but that's it. They aren't building a physical product, they're going to sell other people's products. Or, sell information so that other people can sell other people's products.
I find it absurd that the market for web based adverting, between Google and Facebook and others, can be this valuable in the long run. These are advertisers, for crying out loud. People can talk about how many users Facebook has, but there are more automobiles worldwide than there are Facebook users.
What is worth more; a car purchaser, or a Facebook user?