Mark Zuckerberg is a member of the Google generation, one too young to remember all the ambitions dashed and fortunes lost when the last dot-com boom ended.

That may be one reason Mr. Zuckerberg, the 22-year-old founder of Facebook, a social networking Web site, has so far shied away from selling his company, rejecting offers that would have made him several hundred million dollars.

“We’re focused on building the company for the long term,” he said yesterday.

When Viacom offered $750 million for Facebook in January, he asked for $2 billion and was rebuffed, according to a person involved in the negotiations. Now, he remains undecided about the latest offer, made in the last few weeks by Yahoo. That offer, first reported by The Wall Street Journal, was confirmed yesterday by two industry executives, one briefed on the deal by Facebook and the other by Yahoo. Both spoke on the condition of anonymity because the negotiations are continuing.

To woo Mr. Zuckerberg, Yahoo has offered about $900 million for Facebook and says it will keep the company somewhat independent, with Mr. Zuckerberg in charge. This has been its model with other acquisitions like Flickr, a photo-sharing site, and Del.icio.us, a social bookmarking service that lets members share lists of their favorite Web sites.

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