Ditto.
In many countries (and even China is on the Net these days), writings critical of the government, such as exposure of human rights abuses, are illegal. The authors face imprisonment, torture and death. By posting anonymously to the Net, the information can be brought safely to the attention of the world.
Perhaps mention the Russian coup, where the net became a conduite for information leaving Moscow. I remember a colleague of mine announcing incidents which had occured within Moscow hours before the news services broadcast them, simply by getting emails from a colleague nearby,
It was even possible to get eyewitness descriptions of much of the troop movement in Moscow in near real-time on #russia. The attack on the Russian White House was in particular quite interesting to watch on CNN and compare what was going on via irc comments.