Is Uno Phrimium a Good Business Model?

Twitter is a service where for every time you do something, i have to pay somebody else. I feel that if uno phrimium works in a lot of services, it does not work in a service like twitter. And at the scale they're runing er's a whole lot of cost to running twitter. Am, that i can't kind of get around, you know, in my head un less than ten seconds worth o thinking about it. This is how i make money and this is how i get users. That, to me, is how, theonly way i can figureout how to run a business. So i have to be very, very simple for myself.