Chinese Twitter, Sina Weibo, did something very smart: it integrated Alibaba's e-commerce capabilities into its service. Imagine Twitter where you could buy anything you wanted with a click, and you get the idea. "Weibo Payment" is that click, and it connects users Alibaba accounts (called Alipay) with their Weibo accounts. It's as if Twitter and PayPay banded up and allowed us to buy whatever we want in our Twitter streat. Why on earth Twitter hasn't already done this, beats me.