Of course it becomes a challenge for countries with large populations in carrying out vaccination programs,
indeed the existence of fake news greatly affects some people and we cannot deny it,
and here the government has an important role to socialize the vaccination program
At least a section of the population tend to blindly believe in the WhatsApp messages and Facebook posts they receive. Even I have received several such messages in the recent times, which claim that anyone taking the vaccine will die very soon and vaccines can make people impotent. Here in India the government tried to arrest people who spread such news, but then the supreme court released them saying that the government can't suppress the freedom of speech. I am sure that this is the case with other countries as well.