In essence it is the same as in every social plattform. Spam spam spam and easy things. Sprinkle some sex, stupidity and easy information on it... viola.. the perfect money making video without a real content and just passing the time of the viewer.
Look at my video about the influence of culture on perception which was an actual presentation on a congress in Brazil. Nothing^^
Yeah, it's kinda true.. youtube is filled with all the same shit aswell. and cool i'll look into that :)