Excerpt from this article:
At times of natural disasters, terror attacks or unrest, Twitter lights up with first-hand experiences, emotion, rumours and speculation. The bigger the news, the more sensational a story, the more noise there is, the further information travels and the harder it becomes to detect the truth. Yet this is when it is also most important to sort out fact from fiction from the frenzied maelstrom of social media.
That’s when swearing comes in. Cussing is one of the clues to figuring out whether a tweet is coming from someone caught up in a major news event rather than a fraud. Letting off a string of expletives seems a natural reaction to a life-or-death scenario.
The f-word turns out to be one of the ingredients in the magic formula sought by scientists studying how to automatically rank the credibility of individual messages. At times of stressful events, such as a plane crash or natural disaster, swear words tend to suggest a message comes from someone in the middle of it all.
Scientists trying to detect the language of truth are less concerned about the actual content of a message. For them, the clues to truth lie in the wording and punctuation of a message.