Facebook quarterly profit falls 9% as costs soar
Expenses set to grow 55 per cent to 60 per cent in 2015
Twitter’s Dick Costolo to step down as chief executive
Wall Street reacts positively to news with shares jumping 3.6 per cent to $37.17
Buzzfeed to use $50m investment to fund new ventures
Deal values viral content specialist at $850 million as it puts more resources into its video arm
Facebook 2.0: how internet giant is cashing in on mobile
Company’s latest quarterly earnings figures confirm the ascendance of mobile
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