Some 23 brands—including Nike, Adidas and Warby Parker—are testing a closed beta version of Instagram with an in-app point of sale. A big, blue “Checkout on Instagram” button will indicate when a product is available. Pre-stored payment information, done through Facebook, will then allow for much quicker purchasing. It’s the latest shopping feature rolling out from the app, and more developments are expected. Read more at The Verge.