Facebook: Accounts from Russia bought ads during US campaign

Hundreds of fake Facebook accounts, probably run from Russia, spent about $100,000 on ads aimed at stirring up divisive issues such as gun control and race relations during the 2016 U.S. presidential election, the social network said on Sept. 6.

Although the number of ads is relatively small, the disclosure provides a more detailed peek into what investigators believe was a targeted effort by Russians to influence U.S. politics during the campaign, this time through social media.

The 470 accounts appeared to come from a notorious "troll farm," a St. Petersburg-based organization known for promoting pro-Russian government positions via fake accounts, according to two people familiar with the investigation. The people were granted anonymity because they weren't authorized to publicly discuss details of the investigation.

In all, the accounts purchased some 3,000 ads between June 2015 and May 2017. While the ads didn't specifically reference the election, a candidate or voting, they nevertheless allowed "divisive messages" to be amplified via the social media platform, the company's chief security officer, Alex Stamos, said in a statement.

Facebook has turned over its findings to federal authorities investigating Russian interference in the U.S. presidential election. Robert Mueller, the special counsel, is charged with overseeing Russian meddling in the U.S. election and any potential coordination with associates of President Donald Trump.

Sen. Mark Warner of Virginia, the ranking Democrat on the Senate Intelligence Committee, said that Facebook briefed the panel's staff on Sept. 6, but he still wants to know more.

"I have a lot more questions for Facebook, and I've got a lot of questions for Twitter," Warner said,...