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Facebook chief executive Mark Zuckerberg leaves a Senate office on Monday. Photo: Alex Wong/Getty Images

Sens. Mark Warner and Amy Klobuchar sent letters Monday to the CEOs of Google parent Alphabet and Twitter urging them to follow Facebook in endorsing their bill to increase disclosure requirements for online political ads.

Why it matters: Beyond Facebook's privacy firestorm, Google and Twitter are getting pulled into other debates surrounding how social media platforms are used during elections. Facebook endorsed the Honest Ads Act last week in a move that armed CEO Mark Zuckerberg with ammunition for his hearing appearances this week and put pressure on its rivals to follow suit.

What they’re saying:

  • The senators said in letters to the chief executives of Alphabet and Twitter, Larry Page and Jack Dorsey, that they “encourage you to follow Facebook’s lead and endorse the Honest Ads Act.”
  • They also encouraged the companies to take further voluntary steps to be transparent about political ad spending on their platforms.

Dorsey and Google CEO Sundar Pichai had initially been called to testify before the Senate Judiciary Committee along with Zuckerberg until the panel arranged a joint session with the Senate Commerce Committee featuring the Facebook chief alone.

  • But Sen. Bill Nelson, the ranking Democrat on the Commerce Committee, said executives from Twitter and Google should have to testify. “Absolutely, because it’s not just Facebook,” he told reporters after meeting with Zuckerberg Monday. “He happens to be the point of the spear, but all of these other app sites that get your personal data, that’s another way of us losing our privacy.”

The bottom line: Most criticisms of Facebook's overall business model — which harvests user data for ad targeting — could be applied to Google and Twitter, too. They won't be spared from having to answer similar questions.

Go deeper

Federal court blocks Biden's vaccine mandate for health workers in 10 states

President Biden delivers remarks on the Omicron COVID-19 variant following a meeting with his COVID-19 response team. Photo: Anna Moneymaker via Getty Images

A federal court in Missouri has blocked the Biden administration from enforcing a coronavirus vaccine mandate for health care workers at federally-funded facilities in 10 states.

Why it matters: Monday's decision is the first victory for opponents of the rule, which requires health care workers to get vaccinated by Jan. 4, 2022. The case is one of four lawsuits challenging the Centers for Medicare & Medicaid Services' (CMS) rule and argues that the mandate will exacerbate staffing shortages.

Twitter's next act

Illustration: Annelise Capossela/Axios

Twitter co-founder and CEO Jack Dorsey is exiting the company he helped build at a time when its future has never been so uncertain.

Why it matters: The person who controls Twitter controls the de facto public square — with implications for politics, media and free speech.

50 mins ago - Health

CDC strengthens COVID booster recommendation

Rochelle Walensky. Photo: Chip Somodevilla/Getty Images

The Centers for Disease Control and Prevention (CDC) on Monday strengthened its previous recommendation for booster shots, saying that everyone 18 and older "should" receive a booster dose.

Why it matters: Last month, CDC director Rochelle Walensky accepted a key advisory committee's recommendation that adults "may" get the shot. The slight, but strengthened, change in wording comes amid the emergence of the Omicron coronavirus variant.