A calculator developed by a 12-year-old girl and her Irish father has become the number one-rated app worldwide on Amazon's Android App Store.

Apple has been accused of using Ireland as a way of avoiding billions of euro in tax.

Europe's economic woes were felt by Vodafone today after the mobile phone giant reported its first drop in annual revenues for seven years.

Marks and Spencer has announced a fall in full-year profits.

US tech giant Yahoo has snapped up Tumblr in a major US deal that will reportedly net the blogging site's 26-year-old founder a $250m (€194m) fortune six years after he started it.