Can using Twitter in China really get you in trouble?
Arrest of Twitter users in China sparks fears, but do they affect travelers?

So should you worry about tweeting in China? As with most things, the answer isn’t clear-cut.
It may seem that visitors are exempt. After all, Twitter is readily accessible to travelers through data roaming on a foreign SIM card… despite the fact that it’s officially blocked in China and inaccessible to locals without a VPN.
(Though, funnily enough, most state-run Chinese media outlets have official Twitter accounts -- to broadcast stories to readers outside the country, of course.)
The current crackdown also seems targeted at local critics of the government: Chinese citizens living in China.
In contrast, foreigners -- including reporters living and working in the country -- seem to be free to voice criticisms of the government on Twitter.