Disappointing Twitter response in a serious harassment case
Those posts were very personal and abusive, including names of employees and some very sick comments.
However Twitter support failed to recognise this as a threat and replied with a canned response to those who submitted a support ticket:

What a Twitter #fail. I just hope Telecom New Zealand notify the police, and spend some of its lawyers' time to pursue this further.
Shame on you Twitter.
UPDATE: After some review, the appropriate Twitter team decided to remove that account. Thanks to all involved, and Twitter for reviewing it.
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Did Twitter really take in consideration these DMCA notices?
Comment by James, on 25-Feb-2010 18:46
Twitter is being smart.
If they embark down a road of removing comments such as these, they can conceivably be held responsible for those they do not remove.
If they remove nothing, they can maintain the comments posted on their site "at arms length" (common carrier if you like).
If the comments do not violate the ToS of Twitter, they should not remove.
It is up to the aggrieved party to take issue with the commenter through the legal process.
Comment by James, on 25-Feb-2010 19:12
Yes, I saw the originals. Clearly it was defamatory personal attacks from an unhinged individual.
But simple answer is, that obvious defamatory personal attacks from an unhinged individual don't immediately appear to be rule breaches at twitter (this said, I'm not now, nor have I ever or likely will ever be, a twitter user).
Twitter, and other social networking sites like this have a very fine line to walk, and an ENORMOUS amount of content passing through them.
I imagine they probably get thousands of "complaints" each day, from annoying teenagers and the like, "waah twitter, so and so called me a ...". They need to stick to their rules or they wind up with a hideous "shades of grey" situation.
Perhaps they need to change the rules, to make this sort of thing clearly against them, but I would hazard a guess that it would be a pretty hard thing to quantify.
You can easily moderate geekzone, you have only a few thousand members, probably a few hundred activly posting ones. You can put time and consideration into each moderation decision made, you can explain to those involved your decisions etc... Twitter hasn't a hope.
I'm not saying the comments should or should not be there, just that twitter need to have black and white rules otherwise their service would not be practical, calling them a "fail" for following their rules - that seems pretty unfair.
Comment by Neil Forster, on 25-Feb-2010 23:17
Thanx for the support everyone on this, and Mauricio for leading this publicly.
I had raised a formal complaint with Twitter and got the same canned responses. Though I've still requested an update.
We noted the account is locked now, and yes the "troll" may return under a new name, but with the content of these tweets, we feel a line was crossed a it did need to be addressed directly.
Cheers
Comment by Nightwyrm, on 26-Feb-2010 09:44
Twitter use a third-party support desk, who's service at best is mediocre.
I had an issue in the past for which I received appalling service from Twitter Help, including closing my ticket without notification. At the time, I was put in contact with one of the main Twitter staff, and she resolved my issue in 5 minutes.
With this particular individual, I didn't even think of the Twitter Help, I just sent the details direct to the staff member I've contacted before.
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Comment by chiefie, on 25-Feb-2010 18:18
This is my tweet to @delbius as apparently @coati just issue what seem to be a standard reply. I doubt @coati checked or read the content of the complaint I logged which has two links to the blog post and forum post.
http://twitter.com/chiefie/status/9612546868