Special counsel Robert Mueller and his office “have interviewed at least one member of Facebook’s team that was associated with President Trump’s 2016 presidential campaign,” Wired reports.

“Facebook and other social platforms have emerged as a key part of that investigation, not only because the company embedded staff with the San Antonio-based digital team working on Trump’s campaign, but also because it sold more than 3,000 Facebook and Instagram ads to fake accounts linked to the Russian propaganda group Internet Research Agency.”

“Facebook is a living, breathing crime scene for what happened in the 2016 election — and only they have full access to what happened.”

— Tristan Harris, former design ethicist at Google, quoted by NBC News.

“Disguised Russian agents on Twitter rushed to deflect scandalous news about Donald Trump just before last year’s presidential election while straining to refocus criticism on the mainstream media and Hillary Clinton’s campaign,” according to an Associated Press analysis of since-deleted accounts.

“The analysis illuminates the obvious strategy behind the Russian cyber meddling: swiftly react, distort and distract attention from any negative Mr. Trump news.”

“Russian operatives targeted users on Facebook by race, political preference, religion and interests such as gun ownership, according to advertising data released by lawmakers as part of congressional investigations into Russian manipulation on social media around the U.S. election,” the Wall Street Journal reports.

“The new data show the sophistication of the Russian effort to hit precise groups of people to amplify specific, simmering tensions within the U.S.”

Politico: The social media ads Russians wanted Americans to see.

Politico: “Facebook has been happy to keep congressional investigators focused on the Russian-bought online ads that helped sway voters in last year’s election — despite the many other ways that fake messages and bogus accounts spread on the dark side of social media.”

“But that may be about to end: Facebook, Twitter and Google are preparing for hearings this week where lawmakers are expected to grill the companies about the broad reach that foreign actors achieved through fake accounts and deliberate misinformation, a topic that encompasses far more than the 3,000 paid political ads that Facebook disclosed last month.”

BuzzFeed News: “To truly understand how Facebook is responding to its role in the election and the ensuing morass, numerous sources inside and close to the company pointed to its unemotional engineering-driven culture, which they argue is largely guided by a quantitative approach to problems. It’s one that views nearly all content as agnostic, and everything else as a math problem. As that viewpoint has run headfirst into the wall of political reality, complete with congressional inquiries and multiple public mea culpas from its boy king CEO, a crisis of perception now brews.”

Alexis Madrigal: “When I was editor in chief of Fusion, we set about trying to track the ‘digital campaign’ with several dedicated people. What we quickly realized was that there was both too much data—the noisiness of all the different posts by the various candidates and their associates—as well as too little. Targeting made tracking the actual messaging that the campaigns were paying for impossible to track. On Facebook, the campaigns could show ads only to the people they targeted. We couldn’t actually see the messages that were actually reaching people in battleground areas. From the outside, it was a technical impossibility to know what ads were running on Facebook, one that the company had fought to keep intact.”