Elon Musk’s X has disabled a feature that let users report misinformation about elections, researchers say.
Reset.Tech Australia said the feature had been removed in recent weeks, except in the European Union.
The move has fuelled concern ahead of a key Australia referendum to give Indigenous people more rights as well as the 2024 US presidential elections.
Australian authorities say the spread of electoral misinformation is the worst it has seen yet.
The tool, available in the US, Australia and South Korea since 2021, was expanded to other countries last year.
In a letter, Reset.Tech Australia called the move “extremely concerning”, as Australia is set to hold a referendum next month.
“There now appears to be no channel to report electoral misinformation when discovered on your platform,” the group said.
Users can still report posts that they consider to be hateful, abusive or spam.
Australia’s first referendum in almost a quarter century will take place on 14 October.
The move could also affect voters’ ability to report misinformation ahead of the 2024 US presidential elections.