[iliveinchina]

In such an environment, anecdotes may be among the most accurate information one can get.

I've never really seen such personally. People occasionally petition the central government due to grievances, but those people are heavily monitored, strongly discouraged, and later suffer negative repercussions (I know one such individual personally).

There are occasionally protests regarding local issues: housing demolition, environmental problems. They are not allowed to persist. I've never seen these in person.

I used to very occasionally see graffiti critical of the government, but I don't think I've see such in 5+ years. I figure the omnipresence of the security cameras have discouraged this.

I once received a robocall from the Falun Gong critiquing the government. I also occasionally see Falun Gong messages stamped on paper currency.

That's about it. I'm curious about the specifics of the case(s) about which you've heard.