Top business stories
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Twitter heads for stock market debut by filing for IPO
After years of speculation, Twitter has filed in private for an initial public offering, the first step towards going public
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UA will honour $5 to $10 flight tickets
Human error blamed for period in which only airport and security fees were charged and customers rushed to purchase
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Jeffrey Zeints to head NEC
Obama appoints Zeints, acting budget director of the White House, to replace top economic advisor
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Greek bailout back on agenda
International lenders estimate Greece will need another €10-11bn from the second half of next year
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Dell buys back PC firm for $24.8bn
Buyout seen as way to refocus ailing computer manufacturer as popularity of tablets forces shift to corporate market. By Charles Arthur
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Markets wipe $30bn off Apple's value
Analysts disappointed as high price of 'budget' 5C will put it out of reach of many buyers worldwide