San Francisco: Facebook has yet again come under critical observation in India after its instant messaging app WhatsApp with 300 million users in the country became a medium for the rapid spread of anti-vaccine misinformation.

"Anti-vaccine misinformation, some of it from social media posts in the West, is spreading in India on WhatsApp, undermining efforts to root out measles and rubella in a country where tens of thousands of people are struck by the diseases each year," The Wall Street Journal reported on Saturday.