Twitter and Weibo: How do they match up? These are two of the most influential social media platforms in the U.S. and China, respectively. But their approaches to hotly contested questions concerning how social media is governed — from how to make money to account verification and content moderation — differ greatly.  A whirlwind of feature changes and policy flip-flops at Twitter have grabbed headlines in recent weeks. And as Twitter lurches from change to change under the mercurial