US Democratic congresswoman Alexandria Ocasio-Cortez has raised concerns about troubles with her Twitter account after trading barbs with the platform's new boss Elon Musk about the introduction of a monthly fee for verification of users.
The heated exchange came after Mr Musk this week tweeted his disapproval of "Twitter's current lords & peasants system for who has or doesn't have a blue checkmark" when he introduced a basic rundown of an $US8 Blue plan.
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