1) The art of polite disagreement
While the inane spats of YouTube commencers may not be representative, the internet has certainly sharpened the tone of debate. The most raucous sections of the blogworld seem incapable of accepting sincerely held differences of opinion; all opponents must have "agendas".
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31) Privacy
We may attack governments for the spread of surveillance culture, but users of social media websites make more information about themselves available than Big Brother could ever hoped to obtain by covert means.
and others...