Facebook says it will build a web page to allow users to see which Russian propaganda accounts they have liked or followed after US politicians demanded the social network be more open about the reach of the accounts.
US politicians say the move is a positive step, although it falls short of their demands that Facebook individually notify users about Russian propaganda posts or ads they were exposed to.
Facebook, Alphabet Inc's Google and Twitter Inc are facing a backlash after saying Russians used their services to anonymously spread divisive messages among Americans in the run-up to the 2016 US elections.
US lawmakers have criticised the tech firms for not doing more to detect the alleged election meddling, which the Russian government denies involvement in.
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Facebook says the propaganda came from the Internet Research Agency, a Russian organisation that according to lawmakers and researchers employs hundreds of people to push pro-Kremlin content under fake social media accounts.
As many as 126 million people could have been served posts on Facebook and 20 million on Instagram, the company says. Facebook has since deactivated the accounts.
Facebook says it will let people see which pages or accounts they liked or followed between January 2015 and August 2017 that were affiliated with the Internet Research Agency.
The tool will be available by the end of the year as "part of our ongoing effort to protect our platforms and the people who use them from bad actors who try to undermine our democracy," Facebook said in a statement.
The web page will show only a list of accounts, not the posts or ads affiliated with them, according to a mock-up. US lawmakers have separately published some posts.
It was not clear if Facebook would eventually do more, such as sending individualised notifications to users.
Lawmakers at congressional hearings this month suggested that Facebook might have an obligation to notify people who accessed deceptive foreign government material.
Senator Richard Blumenthal, a Democrat who had asked for notifications, said Facebook's plan "seems to be a serious response" to his request.
