Pity those of us who monitor the ups and downs of China's popular microblog platform, Sina Weibo. For every story its users spread in defiance of local censorship, there follows a clampdown. Whether it's the latest strike against rumors, or real name registration, or newly banned keywords, there's always another restriction in the works as the service struggles to keep a lid on sensitive conversations without driving away its user base. "China tightens grip on social media," we might report, as the Financial Times did in April. And last October. (The U.K.-based newspaper also noted China's grip tightening on lawyers in March.) It's not that these headlines are misleading. They simply show how difficult it is to illustrate the grip that always tightens, but never quite suffocates.