I don't know the details of the case, but it would make sense to sue them in order to get the IP from which the edits had been made.
It may well be that the only way to stop the postings is to find out who is doing them and sue that person, but organisations like wikipedia and facebook don't hand that information out without a concrete reason.
I don't know, but it might not be as bad a story as it's being painted.
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Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
Comes willowing across the sand;
And everthing is Green and Submarine
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