Twitter has shut down hundreds of accounts that were tied to the same Russian operatives who posted thousands of political ads to Facebook during the 2016 US election.
The company said it found 22 accounts which were directly linked to the 450 Facebook accounts, found earlier this month.
It also found a further 179 accounts related or linked to those Twitter accounts.
None of these accounts had been registered as advertisers, and all of them had already been or were immediately suspended, most for violating spam rules.
Twitter said Russian media outlet RT — which has strong links to the Kremlin — spent at least $274,100 on advertisements on the platform in 2016.
The three accounts — @RT_com, @RT_America, and @ActualidadRT — also promoted 1,823 tweets the company says “definitely or potentially targeted” the US market.
Those ad buys alone topped the $100,000 that Facebook had linked to a Russian propaganda operation, a revelation that prompted calls from some Democrats for new disclosure rules for online political ads.
Twitter’s disclosures ‘deeply disappointing’
Although Twitter’s disclosures in briefings to US congressional staff and a public blog post were its most detailed to date on the issue, the top Democrat on the Senate Intelligence Committee called the company’s statements “deeply disappointing”.
Senator Mark Warner, whose panel is investigating alleged Russian interference in the election, said Twitter officials had not answered many questions about the Russian use of the platform and that it was still subject to foreign manipulation.
Twitter has been criticised as being too lax in policing fake or abusive accounts.
Technology companies including Twitter, Facebook and Google were asked by intelligence committees earlier this week to testify at a public hearing on November 1 about alleged Russian interference.
The pressure on the companies reflects growing concern among politicians in both parties that social networks may have played a key role in Moscow’s attempts to spread disinformation and propaganda to sow political discord in the United States and help elect President Donald Trump.
Moscow denies any such activity and Mr Trump has denied any talk of collusion.