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Perhaps one of the most useful tools for someone who engages in arguments online (I know, I really shouldn’t feed the troll, but it is funny!), your logical fallacy has a list of twenty-four more or less common logical fallacies found in public discourse, with clear, logical and convincing definitions and examples.
This is a great tool for two purposes. One is identifying when others commit them, and may be a good way of pointing it out (though you may want to see that you don’t use it as a suppression technique). The other, to me more useful, purpose, is to use it as a guide to things to avoid, in order to better your own part in public discourse.
Whichever way you choose to use it; enjoy!