::Media bias does not necessarily refer to bias of the entire media, but often refers to bias in one particular medium or one particular individual.  If, for example, the anchorman for World News thinks New Yorkers are better than Californians, and slants stories to show how great New Yorkers are and what fools Californians are, that's an example of media bias. 

 ::There is considerable evidence that everybody is biased, and that media bias is impossible to overcome, but at least we should be aware of the problem.