People who post on social media often don't fact check themselves or make sure that there is any evidence to back up their claim and this can lead to not only one person being misinformed but all the people who saw what they posted being misinformed about what is actually going on in the world

Yes but in this case it lead to unnecessary violence and there is also other incidents where people on social media caused an unnecessary amount of violence because of misunderstanding or their opinions that not every on agrees with

Fake news spread through social media sites can also have a physical effect like In myanmar when misleading images that depicted violence caused an uproar that killed more than 400 people

but it also allows the spread of misinformation like the 2016 incident when fake news was spread about the pope endorsing Trump