Only story I found in news search ... Doesn't mention policy or policies violated. Seems to imply it is business on business warfare, or at least that's how I read the article.
EDIT: Another one popped up on refresh. http://techcrunch.com/2011/02/18/twi...ting-policies/
EDIT #2: From update to article at first link....
In an email to TechCrunch, Twitter says "violations include, but arenxxx8217;t limited to, a privacy issue with private Direct Messages longer than 140 characters, trademark infringement, and changing the content of usersxxx8217; Tweets in order to make money."
In the meantime, here are some possibilitiesxxx8230;
There is suspicion in some quarters that Gross is roping all these Twitter apps together to build a network between them that would rival Twitter's.
Some say the issue is the Facebook influence over UberMedia will bother Twitter. Accel partner Jim Breyer, who sits on Facebook's board, will now also take a seat on UberMedia's board.
One source says Twitter hates the idea of letting another company control its UX/UI, and doesn't think it needs to be shown how to make money.
It's possible Twitter worries that Google or Facebook will see buying UberMedia and using it as a toe-hold to launch a Twitter clone as a cheaper alternative to spending $10 billion to buy Twitter. One source close to TweetDeck hints: "Uber-oogle?"
We don't have all the facts in front of us, but on the surface, this seems like a poor decision on Twitter's part.
CEO Dick Costolo is having a hard time coming up with a way to make money. If UberMedia figures it out, Twitter has enough funding and brand power to be able to buy UberMedia or just copy it.
Further, Twitter wants to become a platform company like Facebook or Google. For that to happen, though, Twitter needs a business or two to grow up and become dependent on the platform. Then, Twitter would be able to either tax that business the way Apple taxes iPhone app-makers and Facebook taxes Zynga.
Even if UberMedia is not destined to be THE business that figures out monetization for Twitter or turns Twitter into a platform company, Twitter's draconian measures here might keep other entreprenuers from trying.