Social media giant Twitter on Thursday released a new archive of state-backed propaganda from accounts it has banned based in Iran, Russia, Spain and Venezuela.
The US platform said it had taken the material off its network, but would make it available to researchers and investigators studying online threats.
Tech firms have been accused of allowing political propagandists to use social media to hijack elections, poison online debate and smear their opponents.
But Twitter, in a blog post by head of site integrity Yoel Roth, said "transparency is core to our mission" and vowed to fight "misleading, deceptive, and spammy behaviour".
Thursday's release was the firm's third such archive, representing more than 30 million tweets and a terabyte of media data from just under 5,000 suspected accounts.
Twitter has removed 4,779 accounts it believes "are associated with -- or directly backed by -- the Iranian government."
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