The Washington Post: Jennifer Aniston and other celebrities endorse vaccines. Experts say their pleas may not help.

“I’ve just lost a few people in my weekly routine who have refused or did not disclose, and it was unfortunate,” Aniston said to the magazine. High-profile stars and influencers can be useful, said Damon Centola, a Penn sociology professor. Their wide recognition and admiration make them essential for marketing products and raising awareness. The problem comes when the sell is a more complex idea that involves social norms. In those cases, he said, relying on fame and influence generally has been unsuccessful. Read the full story in The Washington Post.