Stripe, a startup already valued at $5 billion, just introduced easy-to-use tools that enable retailers to sell goods on Twitter and e-commerce apps including ShopStyle and Spring. Dubbed Relay, the new tools strip away the complications and expense of adding a “buy button” on Twitter and other apps. Stripe says a retailer can add that button with Relay in as little as 30 seconds. In addition to Twitter, Stripe has also partnered with Facebook and Pinterest, although neither company has yet to launch Relay. Continue reading Stripe’s Relay Simplifies E-Commerce on Apps and Social Media