The social network reportedly shared with Mueller copies of the ads that were purchased as well as details on what targeting options were used to purchase the ads.
Twitter Inc was expected to brief USA congressional investigators soon on whether Russian Federation used its advertising platform to promote divisive social and political messages, a US senator said last week.
The social networking site, based in Menlo Park, Calif., has not shared such detailed information with Congress, "in part because of concerns about disrupting the Mueller probe, and possibly running afoul of US privacy laws", the Journal reported.
The warrant obtained by Mueller means his team now has more information to look into how Russian Federation used social media to meddle in last year's presidential election.
Facebook informed Congress last week that it had identified 3,000 ads that ran between June 2015 and May 2017 that were linked to fake accounts.
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Sen. Mark Warner, the top Democrat on the Senate Intelligence Committee, told CNN last week that Facebook had not turned over the ads to Congress. Warner has also called Facebook's review "the tip of the iceberg", and suggested that more work needs to be done in order to ascertain the full scope of Russia's use of social media.
There's more to the $100,000 in ads that Facebook sold to a Russian propaganda company. "To justify forcing FB to give up the info". The ads were targeted at American Facebook users and covered issues like gun rights and immigration.
Now, Mueller's team has them as part of its investigation into Russian meddling in the 2016 USA presidential election. "That means that he has uncovered a great deal of evidence through other avenues".
"We have shared our findings with U.S. authorities investigating these issues, and we will continue to work with them as necessary", Facebook Chief Security Officer Alex Stamos said in a post last week.
The implications for Trump campaign staffers are not good, given that the targeted ads bought by foreign interests were geographically targeted to very specific regions where polling showed Democratic nominee Hillary Clinton was vulnerable.