FB is that most egalitarian of communities, making present the spirit of the French Revolution in new and unimaginable ways. Can you imagine a medium by which the Dunning Kruger effect could be demonstrated over and over again with such perfection? I know-as a few of you must-from daily first-hand experience that the very people who are smugly superior while proving their near-total ignorance of a topic on FB are also the least likely to speak up in a public forum. I fear that in the same manner a virus spreads, this online behavior must inevitably have an adverse effect on the cumulative IQ of the species.
This never reflects well on you, or your argument. It also plants the idea in the mind of your audience that perhaps people who believe like you all suffer from a weak and/or corrupt mind. This is not a fair observation, but it is a likely one. If you want to advance truth, you care more about effective persuasion than hurting your interlocutor.