Dick Costolo, Twitter’s embattled chief executive, at the New York Stock Exchange during the company’s market debut. Photograph: Richard Perry/The New York Times

Twitter chief executive Dick Costolo abruptly announced he was stepping down on Thursday amid increasing scrutiny of the company’s slow user growth an(...)

Peter Thiel, co-founder of PayPal:  is an investor in companies including Airbnb, the big-data company Palantir, the spaceflight provider SpaceX and payments company Stripe, four of the most valuable tech companies in Silicon Valley today. Photograph: Clodagh Kilcoyne/PA Wire

The ride-hailing app Uber, the Irish-founded payment start-up Stripe, the apartment rental site Airbnb, and other darlings of the next generation of S(...)

Snapchat will make the new feature, called Snapcash, available for users who are 18 or older with a debit card. (Photograph: LIONEL BONAVENTURE/  AFP)

Snapchat, developer of a mobile application for sending disappearing photos, is teaming up with payments company Square so that users can send cash to(...)

By pushing a button on your iPhone, consumers will be able to  make a purchase at one of the thousands of retail locations, including Macy’s or Walgreens stores, using the new service. No wallet, cash or plastic card necessary.(Photogaph: Justin Sullivan/Getty Images)

David Donohue has a tough relationship with his wallet and the items inside it. He has lost his wallet twice in the past year. He has fallen victim to(...)

SumUp co-founder Petter Made  addressing the Ibec CEO Conference 2013: at the Convention Centre in Dublin last year. Photograph: Alan Betson/The Irish Times

SumUp, an international mobile payments technology company with operations in Germany and Britain, has decided to close its Dublin headquarters just 1(...)

Foodpanda’s office, an online takeout delivery service for restaurants that mirrors the popular American company GrubHub, in Berlin. International companies like Rocket Internet, which funds e-commerce start-ups that mimic proven business models, are operating in sharp contrast to Silicon Valley, where originality is prized

For Linio, think Amazon for Mexicans. For Zalora, think Zappos for Malaysians. For Easy Taxi, think Uber for Nigerians. And for all of them, th(...)

None of Twitter’s founders comes off well in Nick Bilton’s absorbing book about the creation of the social media firm. Kacper Pempel/Reuters.

Is there some rule that the founders of social networks have to behave so anti-socially? The twists, turns and double-crosses in Hatching Twitter, Nic(...)

Potential investors in Twitter have been left in the dark about key facts. REUTERS/Dado Ruvic/Files

A tweet running to 135 characters was all it took late on Thursday to launch one of the year’s biggest financial stories: that Twitter has taken the(...)

The automatic payment app that has generated the largest seed funding round in Silicon Valley history remains largely a mystery, but technology inside(...)

At PayPal parent eBay’s analyst day today, analysts are likely to seek core details about fees MasterCard, and possibly Visa, plan to ch(...)