The Twitter logo is shown at its corporate headquarters in San Francisco, California

Four senior Twitter executives are leaving the media company, chief executive , the biggest leadership changes since co-founder Jack Dorsey returned a(...)

Twitter 140-character constraint. Photograph: Getty Images

Nothing gets people on Twitter quite as reliably exercised as changes made to how Twitter works. And this week, news of a big change broke – according(...)

A thrill-seeker carries a surfboard crosses the puddle outside Drummond Central in Newcastle upon Tyne, which became an internet sensation with tens of thousands of people watching it on Periscope. Photograph: Tom White/PA Wire

The internet has outdone itself again. Thousands of people worldwide have downed tools to watched a live stream of people crossing a big puddle in nor(...)

Twitter chief executive Jack Dorsey has been pushing the company to think of ways to make the product more engaging.  File photograph: Dominic Lipinski/PA Wire

Twitter may be preparing to raise its character limit to the thousands from the current 140 for tweets, a person with knowledge of the matter sai(...)

As Howard Schultz of Starbucks, a superb peddler of drivel, put it: “Innovation is the force that will . . . enable us to expand and increase revenues and profits – always through  the lens of humanity. Photograph: Dara Mac Dónaill

Last year was a ripping one for flannel. I know I say that every year, but 2015 broke all records for obfuscation, euphemism and ugliness. Sifting thr(...)

John Collison  of Stripe , speaking at the Web Summit in the RDS Dublin. Photograph: Eric Luke

WINNERS Patrick and John Collison It has been a very good year for Limerick brothers Patrick and John Collison of Stripe. In July their digita(...)

Identify those pictured:  One led a successful stock market IPO; another has been appointed to a high-profile role with an Irish bank; another stepped down recently as a director with an Irish listed company; while the other now leads one of Ireland’s biggest media and communications groups.

So, you think you know your business? Here are 30 questions that will test your knowledge. Good luck with the answers and Happy Christmas to you all.(...)

Some mused that Square chief executive  Jack Dorsey’s double-jobbing at Twitter was making some potential investors nervous. Photograph: Bryan Thomas/The New York Times

What a difference a year makes. Payments company Square may have been valued at $6 billion in 2014, but when it came to the stock market, things were (...)

Square chief executive Jack Dorsey

Shares of Square, the mobile payments company co-founded and still run by Twitter chief executive Jack Dorsey, soared as much as 64 per cent in their (...)

Shares of Square, the mobile payments company co-founded and still run by Twitter chief executive Jack Dorsey, rose yesterday. Photograph: Scott Eells/Bloomberg

Shares of Square, the mobile payments company co-founded and still run by Twitter chief executive Jack Dorsey, rose as much as 64 per cent in their ma(...)