[填空题]In February 2010, Yahoo got to watch with schadenfreude (幸灾乐祸) as Google drove its new Buzz social network straight over a cliff with inadequate privacy controls. Now Yahoo has decided it wants to head for pretty much the same cliff, just with a slightly firmer grip on the wheel.
Yahoo is enhancing its Yahoo Updates service, a relatively unknown social network that allows users to post status updates, photos, and other content by integrating it directly into Yahoo Mail. The numbers make a compelling case: Yahoo Mail has some 280 nil]lion users; so if it can flip a switch and create a social network around that--why, it’d be a sudden player against Facebook, a global force at nearly 500 million users, and Twitter, at 75 million.
No doubt that is the same thought that occurred to Google when it introduced Buzz as an add--on to its popular Gmail service. That launch didn’t go so well. Yahoo is paying close attention to the mistakes Google made, especially the flaw that allow

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