Jack Dorsey

When PayPal launched its newest mobile payment platform, it joined a wide selection of existing services. Here's a breakdown of the leaders.

Popular mobile transaction startup Square's new app goes well beyond simply accepting payments.

Dwolla's rise as a payment alternative to credit cards isn't thanks to merchants' disdain for plastic alone. Here's how the company's founder used clever social-media strategies to build buzz.

Small businesses are embracing new mobile payment systems, allowing them to make sales without the high fees and long-term contracts associated with traditional credit card processing.

Twitter is quietly raising big bucks -- pegging the company's value at as much as $7 billion. What is Dorsey's secret?

The international Interactive, Film and Music Festival called South By Southwest begins today. And it's all about you.