Teenage Waterford entrepreneur Jordan Casey is interviewed during a break at a conference on European youth in business in Madrid. Photograph: Carlos Lujan/The New York Times

When Waterford’s Jordan Casey takes to the stage to present his technology business, he jumps onto the platform rather than walking up the access ramp(...)

Bono: “oops” – how Bono began his apology for the Apple stunt in which U2’s ‘Songs of Innocence’ album was automatically downloaded to iTunes accounts.   Photograph: Danny Lawson/PA Wire

A is for Adnan Syed. Convicted of the 1999 murder of Hae Min Lee, the Baltimore man’s case is the subject of this year’s most talked-about investig(...)

WhatsApp co-founder Jan Koum (back left) is pictured during a reunion of his old security group, w00w000 in San Francisco, California. Photograph:   Suzan Song/Handout via Reuters

A few days after selling WhatsApp to Facebook for $19 billion, Jan Koum stepped into a suite at the St Regis Hotel in San Francisco to celebrate wi(...)

Denis O’Brien grew his wealth by $800 million last year, according to Forbes, making him the second richest person in Ireland and the 234th in the world with a fortune of $6 billion. Photograph: David Sleator/The Irish Times

Denis O’Brien, the telecoms and media entrepeneur, added $800 million (€579m) to his fortune in 2013, according to the just published Forbes Bi(...)

WhatsApp chief executive an Koum delivers a keynote speech at Mobile World Congress.  Photograph: Albert Gea/Reuters

What’s missing from WhatsApp? According to chief executive Jan Koum, it’s a voice function, but the company plans to remedy that in the second quar(...)

Mark Zuckerberg, chief executive officer of Facebook

There’s a funny YouTube sketch by Dublin’s Pork Street comedy troupe called “There’s Too Many Apps For That”, in which comics Jim Elliot and D(...)

Facebook’s great gamble

How is a US start-up technology company, which employs 50 people but has 450 million users of its global messaging application, worth $19 billi(...)

Never in the history of technology acquisitions has a company’s name been so apt. “What’s the WhatsApp app?” was the tongue-twister on a lot of(...)

WhatsApp, which has 450 million users, has stuck to basic messaging, but also a simple business model of charging users an annual subscription fee of just $1. Photograph: Brent Lewin/Bloomberg

In recent years, a bevy of messaging apps has fought for global domination, with many boasting a lucrative combination of communications featur(...)

WhatsApp co-founder Brian Acton, who was turned by Facebook for a job in 2009. Photo: Peter DaSilva/The New York Times

It turned out to be an expensive mistake for Mark Zuckerberg. A $19bn one to be precise. In the summer of 2009 Facebook turned down WhatsApp co(...)