mean, $30 billion, worth more than companies that actually make things? it seems to me like it's maybe -- and i love twitter, but maybe it's a little overvalued by the market? >> well, of course it's overvalued. but actually, if you look at the numbers, they could have made more and they chose not to. they sold 70 on million shares at $26 a share. they could have sold them at $41 a share. but they didn't want to be facebook. they didn't want to have the problems that facebook had. >> but even at this valuation, it seems to me like twitter has to make a lot of profits, it has to grow far more quickly than it has to now, and thaits that's going to be difficult. as much as journalists love it, a lot of on people are puzzled by it. what is it? it doesn't feel like something that's central to their lives. >> i was talking to someone in silicone valley and they said to me twitter has to go from being a product, something that you use, to a business. and the problem is that the business doesn't exist. they don't have enough revenue