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Home Technology

Anger is all the rage on Twitter when it’s cold outside (and on Mondays)

Of Australia’s 24.6 million people, 18 million, or 73%, are active social media users. Some 4.7 million Australians, or 19%, use Twitter.

The Conversation by The Conversation
29-06-2020 22:05
in Technology
Anger is all the rage on Twitter

Anger is all the rage on Twitter Photo by Morning Brew on Unsplash

Heather R. Stevens, Macquarie University; Ivan Charles Hanigan, University of Sydney; Paul Beggs, Macquarie University, and Petra Graham, Macquarie University

The link between hot weather and aggressive crime is well established. But can the same be said for online aggression, such as angry tweets? And is online anger a predictor of assaults?

Shutterstock

Our study just published suggests the answer is a clear “no”. We found angry tweet counts actually increased in cooler weather. And as daily maximum temperatures rose, angry tweet counts decreased.

We also found the incidence of angry tweets is highest on Mondays, and perhaps unsurprisingly, angry Twitter posts are most prevalent after big news events such as a leadership spill.

This is the first study to compare patterns of assault and social media anger with temperature. Given anger spreads through online communities faster than any other emotion, the findings have broad implications – especially under climate change.

A caricature of US President Donald Trump, who’s been known to fire off an angry tweet. Shutterstock

Algorithms are watching you

Of Australia’s 24.6 million people, 18 million, or 73%, are active social media users. Some 4.7 million Australians, or 19%, use Twitter. This widespread social media use provides researchers with valuable opportunities to gather information.

When you publicly post, comment or even upload a selfie, an algorithm can scan it to estimate your mood (positive or negative) or your emotion (such as anger, joy, fear or surprise).

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This information can be linked with the date, time of day, location or even your age and sex, to determine the “mood” of a city or country in near real time.

Our study involved 74.2 million English-language Twitter posts – or tweets – from 2015 to 2017 in New South Wales.

We analysed them using the publicly available We Feel tool, developed by the CSIRO and the Black Dog Institute, to see if social media can accurately map our emotions.

Some 2.87 million tweets (or 3.87%) contained words or phrases considered angry, such as “vicious”, “hated”, “irritated”, “disgusted” and the very popular “f*cked”.

Hot-headed when it’s cold outside

On average, the number of angry tweets were highest when the temperature was below 15℃, and lowest in warm temperatures (25-30℃).

The number of angry tweets slightly increased again in very high temperatures (above 35℃), although with fewer days in that range there was less certainty about the trend.

On the ten days with the highest daily maximum temperatures, the average angry tweet count was 2,482 per day. Of the ten coldest days, the average angry tweet count was higher at 3,354 per day.

The pattern of angry tweets was opposite to that of physical assaults, which are more prevalent in hotter weather – with some evidence of a decline in extreme heat.

So why the opposite patterns? We propose two possible explanations.

First, hot and cold weather triggers a physiological response in humans. Temperature affects our heart rate, the amount of oxygen to our brain, hormone regulation (including testosterone) and our ability to sleep. In some people, this in turn affects physical aggression levels.

Hot weather means more socialising, and potentially less time for tweeting. Shutterstock

Second, weather triggers changes to our routine. Research suggests aggressive crimes increase because warmer weather encourages behaviour that fosters assaults. This includes more time outdoors, increased socialising and drinking alcohol.

Those same factors – time outdoors and more socialising – may reduce the opportunity or motivation to tweet. And the effects of alcohol (such as reduced mental clarity and physical precicion) make composing a tweet harder, and therefore less likely.

This theory is supported by our finding that both angry tweet counts, as well as overall tweet counts, were lowest on weekends, holidays and the hottest days,

It’s possible that as people vent their frustrations online, they feel better and are then less inclined to commit an assault. However, this theory isn’t well supported.

The relationship is more likely due to the vastly different demographics of Twitter users and assault offenders.

Assault offenders are most likely to be young men from low socio-economic backgrounds. In contrast, about half of Twitter users are female, and they’re more likely to be middle-aged and in a higher income bracket compared with other social media users.

Our study did not consider why these two groups differ in response to temperature. However, we are currently researching how age, sex and other social and demographic factors influence the relationships between temperature and aggression.

Twitter users are more likely to be middle aged. Shutterstock

The Monday blues

Our study primarily set out to see whether temperatures and angry tweet counts were related. But we also uncovered other interesting trends.

Average angry tweet counts were highest on a Monday (2,759 per day) and lowest on weekends (Saturdays, 2,373; Sundays, 2,499). This supports research that found an online mood slump on weekdays.

We determined that major news events correlated with the ten days where the angry tweet count was highest. These events included:

  • the federal leadership spill in 2015 when Malcolm Turnbull replaced Tony Abbott as prime minister
  • a severe storm front in NSW in 2015, then a major cold front a few months later
  • two mass shootings in the United States: Orlando in 2016 and Las Vegas in 2017
  • sporting events including the Cricket World Cup in 2015.
Days with high angry tweet counts correlated with major news events. Shutterstock

Twitter in a warming world

Our study was limited in that Twitter users are not necessarily representative of the broader population. For example, Twitter is a preferred medium for politicians, academics and journalists. These users may express different emotions, or less emotion, in their posts than other social media users.

However, the influence of temperature on social media anger has broad implications. Of all the emotions, anger spreads through online communities the fastest. So temperature changes and corresponding social media anger can affect the wider population.

We hope our research helps health and justice services develop more targeted measures based on temperature.

And with climate change likely to affect assault rates and mood, more research in this field is needed.

Heather R. Stevens, Doctoral student in Environmental Sciences, Macquarie University; Ivan Charles Hanigan, Data Scientist (Epidemiology), University of Sydney; Paul Beggs, Associate Professor and Environmental Health Scientist, Macquarie University, and Petra Graham, Senior Research Fellow, Macquarie Business School, Macquarie University

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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