72 is one of the world's wealthiest people, worth $7.5 billion. >> i think the last piece of ralph lifshitzin ralph lauren is a kernel of insecurity. and it is the fuel that runs the engine that runs the person who personifies the brand. >> ralph does not sit on his laurels for one minute. you can enjoy the moment, but you have to understand you have to keep things going and you cannot be a one trick pony. speaking of ponies. [laughs] ♪ >> live from pier 3 in san francisco, welcome to the late edition of "bloomberg west," where we cover the global technology and media companies that are reshaping our world. i'm emily chang. our focus is on innovation, technology, and the future of business. let's get straight to "the rundown." twitter is on a tear, soaring more than 25% in just the past week and topping 75 -- $75 a share or the first time, all of this for a company that has not yet turned a profit. and caught trying to game google search results. now out in a cold with links for