FTC Said to Have Begun Antitrust Inquiry Into Twitter

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The U.S. Federal Trade Commission has begun contacting software makers as part of a preliminary inquiry into whether Twitter Inc.’s business practices harm competition, two people familiar with the matter said.

The agency is responding to complaints that Twitter is making it harder for some software developers to design applications that run in concert with the company’s service, said one of the people, who asked not to be identified because the matter hasn’t been made public.