TECHNOLOGY 7:33am

Groupon sacks Mason as chief executive

andrew mason of groupon

Departure of founder leaves daily deals group divided

Ore is mined at the Oyu Tolgoi mine in Mongolia. ©Getty ENERGY 8:42am

Rio Tinto and Mongolia mine talks falter

Oyu Tolgoi implements temporary budget as talks continue

From UK 9:42am

Upbeat WPP boosts outlook for advertising

All regions apart from North America report stronger revenues

Facebook Adverts TECHNOLOGY 9:48pm

Facebook buys ad-serving platform

Atlas system will measure effectiveness of ads on social network

TELECOMS 12:01am

Paulson to oppose telecoms merger

Billionaire wary of debt in planned Metro deal with T-Mobile

A burnt auxiliary power unit battery removed from a Japan Airlines Boeing 787 Dreamliner aircraft ©Reuters INDUSTRIALS 7:18pm

Boeing assures Japan of Dreamliner safety

US group visits Tokyo to present plan for fixing batteries

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