OP - What a funny thing to say! On the WUM again I suppose.

None of those 'points' apply tbh, but I do see indications - almost daily - that manners, decorum, courtesy, kindness, wisdom and mindfulness are on a rapid and steep slide, and its not due to any of the reasons given in the OP's list. (Facebook definitely has a detrimental aspect as well as the positive) .

Social media WUMmery is the the new anti-social behaviour , wouldn't you agree Perry, Jace ?