Washington: A social media feed full of like-minded opinions may feel comforting, but experts say it can be dangerous for the political process.

Twitter and other social media sites need taming.Credit:Matt Rourke

The display of the power of a chorus of like-minded voices was demonstrated by a Pew Research Centre report released this week. The study found that 10 per cent of US adult Twitter users generated 97 per cent of tweets mentioning national politics. The most prolific political tweeters accounted for 6 per cent of all US adult Twitter users and 73 per cent of all political tweets.

In general, those who tweeted about politics were also more likely to follow others who share their political views, and to feel more conflicted with members of the opposing political party.

They are also overwhelmingly anti-Trump.

Twitter and other social media companies tout their ability to expose people to multiple points of view. But it frequently doesn't work that way, in large part to the tech companies' algorithms.

Disliked by an unrepresentative majority on Twitter: US President Donald Trump.Credit:AP

As the US becomes more politically divided, so too have social-media users. Because of the ability to follow like-minded users and block those who disagree, people increasingly have the opportunity to find themselves in a social media "filter bubble."

Those bubbles can be exacerbated by companies' algorithms, which tend to recommend joining groups and following other users who agree with users.

But an echo chamber of voices that agree with users can also prove dangerous, researchers say, especially if infiltrated by agents hoping to influence the election.

When information bounces through the chamber, few users take the time to determine its origin and assess its truthfulness, said David Levine, an associate professor at the Elon University law school and the founder of the "Hearsay Culture" radio show about modern technology issues.

"It can be quite dangerous if you're not taking a step back and saying, 'What do I know about the sources of these information and who or what is behind it?' " he said. "It's very easily psychologically, especially if you're coming into it with a particular perspective, to go along with it."

Twitter declined to comment.

The political dangers presented by social media became clear in the wake of the 2016 US presidential election, when a Russian-backed group called the Internet Research Agency sowed social discord online in an attempt to interfere with the United States political process.

The organisation used a variety of digital disinformation tactics – including fake accounts posting about divisive issues – to attack Democratic candidate Hillary Clinton and support Republican candidate Donald Trump, who eventually won the election.

On Monday, Facebook said it removed accounts that appeared to be from the same group, praising President Trump and attacking former vice president and presidential candidate Joe Biden.

Some lawmakers have accused chief executive Mark Zuckerberg of essentially profiting off of disinformation. Zuckerberg was criticised by lawmakers at a hearing Wednesday for what they said were insufficient efforts to crack down on state-backed interference, among other issues.

Zuckerberg told lawmakers that Facebook's defences against disinformation are more "sophisticated than any other company has at this point, and frankly, governments too."

Facebook did not respond to requests for comment.

Pew studied more than a million tweets posted between June 2018 and July of this year by 2427 participants with public Twitter accounts. Among users who tweeted about politics, 72 per cent strongly disapprove of Trump, 25 per cent strongly approve of him and the others had milder opinions on either side.

Pew found that there is a higher percentage of US adults on Twitter who strongly disapprove of the president than is reflected in the country's population. The organisation also noted that those who are strongly anti-Trump are also more likely to tweet about national politics than other groups on the site.

Conservatives have frequently accused tech giants of exhibiting bias against them. While tech companies say they treat all political content equally, conservatives say Silicon Valley's liberal culture and campaign contributions to Democrats paints a different picture. Trump and other prominent Republicans have repeatedly accused Facebook, Google and Twitter of censoring conservatives or making their content less accessible to the public.

Twitter has also been criticised from the other side of the aisle because of its refusal to police allegedly rule-breaking content tweeted by Trump.

The Washington Post

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