The microblogging site Twitter has updated its developer rules to ban third-party clients.

The new rules state that you can’t use Twitter’s API or content to “create or attempt to create a substitute or similar service or product to the Twitter Applications.”

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The rule change comes after Twitter silently broke several popular third-party Twitter clients like Tweetbot and Twitterific starting on January 12th. At the time, the developers behind the apps said they had received no communication whatsoever from the company about what was happening. Then, on January 17th, the company’s developer account tweeted that it was “enforcing its long-standing API rules,” which “may result in some apps not working.” theverge reports.

There seemingly hasn’t been any official announcement of the rule change, either from Twitter Dev or Elon Musk. Twitter doesn’t have a communications department to contact.

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