title: 为什么Facebook认为NewsFeed、Timeline以及GraphSearch是其三大支柱？这三大支柱将支撑起怎样一个不同的Facebook？
topic: 信息流（News Feed）
content: short answer is facebook doesn't know where it goes. theybuild because it's cool， it's different or better from anything alreadyexists， and they think their users may like orand need it. Still simply engineer driven product but it is cool useful. In terms of functionality， timeline records what havehappened， news feed keeps you updated whats happening， and graph search justbrings y
answerer_tags: oh， boy