Google has agreed to a series of audits on its video advertising metrics by the Media Rating Council (MRC), which serves as the effective watchdog for advertising measurement across platforms. MRC will audit three measurement companies that work with Google to measure how often and how much of their YouTube video ads are viewed by actual people.

Why they're doing this: Google doesn't want to lose the trust of ad buyers, especially on YouTube, which eMarketer estimates will add 20% in ad revenue in 2017. Because Google and Facebook have been bullish about releasing proprietary metrics to third-party data measurement companies, ad buyers have been wary about trusting the data they get from third-party vendors.

Why it matters: Google and Facebook have an effective "duopoly" over digital ad revenue, eating up more than 90% of all new ad dollars. In light of this, both companies have experienced heightened pressure to re-assure ad buyers about the quality of the data they release to third-party measurement companies. Earlier this month, Facebook agreed to an internal audit by MRC after they admitted to misreporting video viewing data to publishing partners.

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Appeals court allows House Democrats to continue lawsuit for Don McGahn testimony

Don McGahn in an October 2018 Cabinet meeting. Photo: Chip Somodevilla/Getty Images

A D.C. appeals court on Friday allowed House Democrats to continue their case for testimony from former White House counsel Don McGahn before the House Judiciary Committee.

Why it matters: The ruling has broader implications beyond this specific instance, agreeing that Congress has the standing to sue to enforce subpoenas against executive branch officials even if the White House refuses to comply.

There's little consensus on TikTok's specific national security threat

Illustration: Aïda Amer/Axios

TikTok has become a Rorschach test for how U.S. politicians view China, with little consensus on the specifics of its threat to homeland security.

The big picture: Much of what D.C. fears about TikTok is fear itself, and that's reflected in President Trump's executive order to ban the app by Sept. 20 if it's not sold by parent company ByteDance — alongside another focused on Chinese messaging app WeChat and its parent company Tencent.

U.S. sanctions Hong Kong leader Carrie Lam

Photo: Anthony Kwan/Getty Images)

The Treasury Department on Friday placed sanctions on Hong Kong leader Carrie Lam, following months of tension as she has allowed continued overreach by Beijing to subvert Hong Kong's autonomy.

Why it matters: It's the toughest sanction yet imposed on China for its destruction of Hong Kong’s relatively free political system.