If blogs represent citizen journalism, the credibility of these citizen journalists will be called into question if the practice about to be launched on 15 blogs becomes commonplace. This Monday, 15 bloggers will begin including at least one post a week that mentions a company’s service in exchange for $800 each month. While the paid bloggers are urged but not required to mention the relationship, it still could have a chilling effect on a medium that so far is still riding a wave of popularity based on the presumption that bloggers are saying what they think, not what they’re paid to say.  InternetNews.com has the story.