Twitter announced this week that its “buy now” button would be more widely available to U.S. merchants, by offering the feature to stores that use e-commerce platforms Bigcommerce, Demandware or Shopify to run their online shopping operations. Businesses that use any of the three platforms can tweet out links to products that will appear with a buy button. “A Twitter user can then purchase the product in as few as two taps — one tap on the buy button and a second to confirm the purchase,” reports The New York Times. Earlier this week, YouTube announced that advertisers now have the ability to insert buy buttons in other people’s videos.