Whereas censorship gets quite a bit of attention from various people on the internet, another serious issue that is about as important, is given much less attention. Media framing means that media organizations offer different cues to readers and these cues are known to influence the opinions of readers. That people respond positively to cues - if they lack information that counters it - is a primary reason why propaganda works.
There are a lot of stories nowadays that offer certain cues or that frame stories in a given way. Take this recent CBS story, for example, which is titled "When Did Assange Know Pvt. Manning?". By titling an article this way, the journalist seem to indicate that Assange knew Manning, even if no information has been offered to support this position.
While this may seem like a small thing, it is the combined effort by all the major news organizations to do this that really matters. When everyone promotes similar views, people become more likely to accept those views.