Twitter has just suspended two third-party twitter app developers: UberTwitter and Twidroy, for violating company policy.

According to a statement issued by Twitter, these companies allowed “direct messages longer than 140 characters … [and] changing the contents’ of users’ Tweets in order to make money.”

Twitter also mentioned that it has been in talks with the companies that developed these applications since April 2010 about their policies infringement and that it decided to announce all of this via its support center because many users were going to be affected.

Here’s the full Twitter statement.

We ask all developers in the Twitter ecosystem to abide by a simple set of rules that are in the interests of our users, as well as the health and vitality of the platform as a whole.
We often take actions to enforce these rules; in fact, on an average day we turn off more than one hundred services that violate our API rules of the road. This keeps the ecosystem fair for everyone.

Today we suspended several applications, including UberTwitter, twidroyd and UberCurrent, which have violated Twitter policies and trademarks in a variety of ways. These violations include, but aren’t limited to, a privacy issue with private Direct Messages longer than 140 characters, trademark infringement, and changing the content of users’ Tweets in order to make money.

We’ve had conversations with UberMedia, the developer of these applications, about policy violations since April 2010, when they first launched under the name TweetUp – a term commonly used by Twitter users and a trademark violation. We continue to be in contact with UberMedia and hope that they will bring the suspended applications into compliance with our policies soon.