Why are informal fallacies often plausible and convincing? When, where and by whom are they formulated? Are there circumstances under which the use of informal fallacies can be justified, for example, in public advertising campaigns for a good cause?
In case you are unsure about what informal fallacies are, have a look at the powerpoints on reason on the 'ways of knowing' page. Informal reasoning and logical fallacies are often used synonymously. The page on 'what and how should we believe' also offers some inspiration in terms of propaganda and public advertising. You may wish to use one of the real life situations of the latter page as a starting point for your post.