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Twitter Tells U.S. Senator It’s Cutting Ties to Swiss Tech Firm

  • Co-Founder of Mitto allegedly ran secret surveillance service
  • Mitto has launched internal investigation into allegations
Twitter headquarters in San Francisco.

Twitter headquarters in San Francisco.

Photographer: David Paul Morris/Bloomberg

Twitter Inc. told a U.S. senator it is cutting ties with a European technology company that helped it send sensitive passcodes to its users via text message.

The social media firm said in a disclosure to U.S. Senator Ron Wyden, a Democrat from Oregon, that it is “transitioning” its service away from working with Mitto AG, according to a Wyden aide.