Twitter's 'Buy' buttons: Now open to anyone

Get ready to see a lot more "Buy" buttons on Twitter.

Twitter — with the help of payments startup Stripe — is expanding its buy buttons so that anyone can sell their stuff via tweets. San Francisco-based Stripe introduced a new product Monday called Relay, which makes it easier for retailers to sell their products within third-party apps that use Stripe, including Twitter

Relay is a set of tools that streamlines the buying and selling process for retailers and developers. "For stores, you can use Relay to enable instant purchases in third-party mobile apps," the company wrote in a statement. "For app developers, Relay is a set of APIs for building great in-app buying experiences. People can buy products directly within your app rather than getting pushed to third-party websites." Read more...