Many netizens have not ideas (knowledge) about even simpler than this things, facts, relationships, etc. A lot of kids, not well educated teenagers, people who even didn't graduate in some middle school, people who can't speak/understand simple words and ideas (like 'triangle' or 'Fidel Castro'), people who think that South Korea is under Shanghai, people who think mermaids and ghosts are real...
It's impossible for a person to know and to understand everything, but the problem is that many (in some cases -- most) of the netizens can't get comparatively simple words, constructs, ideas, facts, etc.