A former security chief for Twitter has turned whistleblower and testified that the company misled users and US regulators about gaps in its security.
Peiter Zatko also claimed that Twitter underestimated how many fake and spam accounts are on its platform.
The accusations could affect a legal battle between Twitter and billionaire Elon Musk, who is trying to cancel his $44bn (£37bn) deal to buy the company.
Twitter says Mr Zatko’s allegations are inaccurate and inconsistent.
It says he was sacked in January for ineffective leadership and poor performance.
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