Twitter continues its confident slide into e-commerce with the roll-out of a “buy now” button on both web and mobile portals. The new function allows users to buy products directly from a tweet with a few taps without ever leaving Twitter. The idea is to make mobile shopping quick and easy, so as to facilitate easy purchase. Twitter is currently working on this new feature with 28 partners, including retailers like Burberry and Home Depot, several big pop music acts, and some non-profits.