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While advertising my paper (the one at http://preearth.net/) to various forums, I have found that censorship is very much alive and well, on the internet.
These sites deleted the article (this one) I posted to them and immediately banned me.
This site (and others) just refused to publish it;
These sites (and others) just locked it (after a short period unlocked);
and of course there were many sites that moved the thread to some dark corner where no one would read it. These included;
One of the worst sites was;
which practiced an insidious, underhanded, form of censorship, while pretending that they never censored anything.
The above is not the entire list of sites that censored me, just the one's that I kept a record of.
This was over 35% of the sites I published on.
So,... censorship is extremely common on bulletin boards.