Along with Google and Facebook, Twitter has been criticized for allowing the spread of bogus news - some of which was directed by Russian Federation - ahead of the 2016 United States election and in other countries.
Twitter Inc. said it found another 1,062 accounts linked to the Russian government-backed Internet Research Agency accused of trying to influence the 2016 US presidential election.
Twitter has been conducting an ongoing investigation into its own role in the spread of extremist content and "fake news" during the 2016 election.
Twitter said it shared the information with Congress, telling the legislative body that it found an additional 13,512 Russia-linked bots since its last analysis, bringing the total number to 50,258.
In addition to them being taken down, Twitter also said it will send email notifications to 677,775 people in the USA that interacted with any of these accounts either by following, retweeting or liking a post during the campaign. About 8.4 percent of the 175,993 tweets posted from those accounts were election-related, Twitter said.
Investments will be made in the areas of machine learning technologies that can help detect fake and automated account activity, Twitter said, adding that it is exploring ways to limit users from performing coordinated actions across multiple accounts.
"Because we have already suspended these accounts, the relevant content on Twitter is no longer publicly available".
"However, any such activity represents a challenge to democratic societies everywhere, and we're committed to continuing to work on this important issue", Twitter said.
Facebook, Microsoft, Twitter, and YouTube pledged to build a shared database of digital fingerprints of extremist material of content removed from their services in the hope of making it more hard to share.
The company said that since the 2016 election, it has been working towards developing strategies to prevent bots, troll accounts and "bad actors" from using its platform for nefarious purposes.
In October, Twitter banned media sites Russia Today (RT) and Sputnik from advertising on its platform after determining that both Kremlin-backed news outlets attempted to interfere with and disrupt the 2016 election.
In preparation for the 2018 midterm congressional elections, Twitter said it would verify major-party candidates for all statewide and federal elective offices, and major national party accounts, "as a hedge against impersonation".