As the U.S. battles the largest measles outbreak in decades, big tech companies like Facebook, YouTube and WhatsApp are trying to tamp down the spread of misinformation about vaccines. WSJ’s Spencer Macnaughton explains. Photo Composite: Adele Morgan/The Wall Street JournalSACRAMENTO, Calif.—Hundreds of protesters packed a contentious hearing in the California state Assembly on Thursday to try to stop a proposed state law that would tighten scrutiny of doctors who give medical exemptions from vaccines for schoolchildren. Amid a national measles outbreak that has focused attention on vaccination rates, parents who believe vaccines would harm their children hissed at the legislation’s author, state Sen. Richard Pan, held yellow signs with the word “false” and rallied outside the Capitol with Robert...

Source: Wall Street Journal June 20, 2019 22:53 UTC