The Twitter co-founder's credit card service Square, has announced that it will be selling its Square credit card readers in Walmart - expanding the product outside of tech-based shopping outlets.

Previously the Square card reader was only...

Square, the new company offering an iPhone credit and debit card payment system, has got investor Kevin Rose, co-founder of Digg and others, to star in a new promo video.

You can hit play above to jump right into the action as Rose demos the...