(Bloomberg) -- What’s buzzing on social media this morning:

Larry King, the interviewer whose schmoozy style attracted celebrities, politicians and other newsmakers as guests and made him the star of a top-rated U.S. cable talk show, has died. He was 87.

• King died Saturday morning at Cedars-Sinai Medical Center in Los Angeles. The cause of death wasn’t provided. The cancer and stroke survivor had spent time recently undergoing treatment for Covid-19.

Pfizer Inc. is trending on Twitter. Senior doctors in the U.K. are urging the gap between first and second doses of the Pfizer-BioNTech Covid-19 vaccine doses be halved to ensure efficacy. The U.K. extended the maximum wait from three to 12 weeks to get more people to take the first shot. France may also delay second doses to stretch supplies.

• Large crowds at Heathrow Airport on Friday sparked concerns of virus spread. U.K. only allows residents to travel internationally for “legally-permitted reasons.”

Dr. Deborah Birx said she “always” considered quitting Donald Trump’s coronavirus task force as she worried she’d been viewed as a political person. “I mean, why would you want to put yourself through that, um, every day?” Birx told CBS in an interview that will air Sunday, according to an advance clip. Her term ended as Biden took office.

Protests broke out in cities across Russia as tens of thousands demanded the release of jailed opposition leader Alexey Navalny. Police detained hundreds of people.

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