and/or, even more often IMO, on the regurgitated opinions of others--which support the ranter's pre-determined opinions, and do not actually engage with contrary evidence and opinions, but simply dismisses them by posting one's own "alternative facts" and expecting others to engage with their pre-conceived beliefs rather than the other way around.  

IMO, I usually try to transcend the typical "tit for tat" FB food fight game for the reasons I previously stated.  I try to add more light than heat to any discussion I engage in, and always try to add more substance and a "big picture" multi-disciplinary perspective to any conversation than I find there.

As a result, I think your assertions that I think I have all the answers is silly.  I make my case for my pov--if I have a strong one on any given topic--but never in the sense I think I should have the last word on the subject.  In fact, I usually do so within a framework that acknowledges other possibilities that should be considered.