playing to investors why a company which is yet to make a profit will be a great bed. 26 with thisin tweet from one of the founders. than 230 million users ranging from the president celebrating election victory to celebrities like justin bieber telling his followers that of brazil has been incredible. twitter even treated the details of its own share sale but now it has to prove that it is serious business. decided that despite its lack of profits, twitter was worth around $81 billion. a much bigger and profitable social network, facebook, is worth nearly $117 billion. is valued at $160 billion. the u.s. continues to generate .uge web businesses at an event in london, entrepreneurs from both sides of the atlantic discuss what can be learned from silicon valley. >> a track record, it is possible. come to the valley, you will make a lot of money. you have a place for people do that in europe. >> the secret is that we encourage and foster creativity, innovation, a culture of trial and error. >> investors are already showing great faith of that twitter can start making big profits. find plent