I just learned from a Chinese friend about the 五毛党:

A classmate of him got the following type of job: He gets paid for registering in in internet forums in order to spread the official policies and defend the government . Because each post is supposedly paid 50 cent (五毛), these guys are commonly refered to as  五毛党 in China. I guess that would be "viral propaganda".

I wonder if some of the unmotivated political entries popping up here once in a while can be attributed to the 五毛党?