This is a very interesting article for the purpose of this Blog.
Again we see that the whole thing because of users interacting with the web. What Google is trying to do is quite clear to me but the "VAST MAJORITY OF THE REVENUE REMAINS IN THE HEAD" which means that to make money on the web you must adress your products to a very large number of users.
Users, Users, Users.......US !! Remember.
Signed: Twitt @Michele1940