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A spokesman for Wikipedia said that if the allegations were posted repeatedly the pages could be "locked" to limit those who could edit them. He added, that, because Wikipedia was based in the United States, it was not bound by the injunctions.
Well may that be, but travel to those countries where those injunctions are issued and one could be arrested for comtempt of court.
The US Government has successfully extradited individuals to the USA from other countries for crimes such as software piracy and hacking. Those individuals commited these crimes in their home country. Can't see why another country couldn't do the same.