Is Twitter helping to inflate the tech bubble?

Gigaom - A little over six months after the company raised a gigantic round of financing that valued it at close to $4 billion, Twitter is in negotiations to close other massive round, according to a report in the Wall Street Journal . The latest series could put a value of $7 billion on the real-time information network, the WSJ said. Like its fellow tech stars — LinkedIn, Groupon, Pandora and others — Twitter is clearly taking advantage of what appears to be a red-hot market for technology stocks. But can it generate enough revenue to justify that kind of lofty valuation?

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