russell siegel man, a lecturer in management who spent seven years at microsoft and 11 years at cliner perkinsi asked him to define mvp as it relates to companies. >> it's the idea that you create a very simple prototype. what i call a low resolution prototype. very simple. that allows you to put the product in front much your customers and see if necessity respond to the few pieces of function, the few use cases they want you to respond to. just try to address the core of the problem and don't -- lots of bells and whistles. that could be a lot of waste. you could spend a lot of -- >> this isn't about starting up. it's about when you're launching a new product as an existing company or service. >> in fact, some big companies, one company here, big multibillion dollar company. this is how they launch new products. >> you strip a product or service of bells and whistles and get it out there to a few customers and see what they think? >> yeah. it's all about experimentation. see if customers have some interest in doing what you're doing even at a very early stage. the earlier the better. in a sen

coming in later with bigger checks, but twitter had a higher valuation, silicon valley giants cliner perkins as dst global. now, the investors' paydays hinges on what the s-1 reveals about the company's financials. e-marketer estimates there's about $580 million in revenue this year, about half of that coming from mobile. both of those numbers are, of course, expected to grow. the one factor analysts point out in terms of twitter's growth prospects, the fact it has only 240, 240 million daily active users. compared to facebook, it's not that much, which means there is significant growth potential. carl? >> thank you very much, julia boorstin, in san francisco right outside twitter's headquarters with that fancy sign. meantime, kayla has some more on the bankers involved in the ipo. good morning, kayla. >> good morning, kayla -- you're not care la. i'm kayla. >> i go buy kayla, too. >> sometimes you do. it's friday. we've all had a long week. carl, it seems like it's bankers singular. we don't know much about the contents of the s-1, but we know it won't contain the full slate of banks. the l