In recent years, citizen journalism has become a widely known phenomenon. It involves ordinary citizens witnessing events, documenting them on their mobile phones and sharing them on social media, researchers said.
It has become an increasingly important news source that often sets the tone of how an event is perceived by the world, they said.
"Common within this type of citizen journalism is that it is perceived as truth to at least the same extent as ordinary journalism," said Agneta Mallen from Lund University in Sweden.
"Another problem with citizen journalism is that it opens the door to cyber bullying," said Mallen.
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She analysed a video clip that circulated a few years ago under the name "Crazy Granny", which shows an elderly woman who looks as if she is trying to sneak away without paying for her taxi fare.
The clip has been viewed hundreds of thousands of times, and in hundreds of comments the woman is defamed and ridiculed.
However, the woman was not at all trying to avoid paying for her taxi fare, but rather the conflict was about her accidentally spilling on the seat of the taxi, and the fact that the driver wanted her to pay damages before letting her leave, she said.
The police classified it as an accident and immediately closed the preliminary investigation.
"But the damage was already done. The woman had already been humiliated in a massive cyber bullying campaign, and never received any redress," said Mallen.
According to Mallen, it is important to realise that video clips filmed with a mobile phone only show part of the truth and that the person being filmed does not have any say on the material before it is published online.
The findings were published in the Journal of Scandinavian Studies in Criminology and Crime Prevention.