The paper studies the manipulation on comments from generalist online newspapers. It is analysed the contexts of interactivity between online media and public. The forums media are an alternative to tendencies of manipulation exerted by media. At the same time, some comments create an image or argument that favours their particular interests. The tactics of commentators may include the use of logical fallacies and propaganda techniques.They promote a manipulation of opinions, atitudes and

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... ours from outside of media. The are arguments regarding the control of media forums by political, economical, religious, mediatic power.