post this month, Mr. Zuckerberg said it was “deeply illogical” that the company would give priority to harmful content because Facebook’s advertisers don’t want to buy ads on a platform that spreads hate and misinformation.

“At the most basic level, I think most of us just don’t recognize the false picture of the company that is being painted,” he wrote.

When Mr. Zuckerberg founded Facebook 17 years ago in his Harvard University dorm room, the site’s mission was to connect people on college campuses and bring them into digital groups with common interests and locations.

Growth exploded in 2006 when Facebook introduced the News Feed, a central stream of photos, videos and status updates posted by people’s friends. Over time, the company added more features to keep people interested in spending time on the platform.

In 2009, Facebook introduced the Like button. The tiny thumbs-up symbol, a simple indicator of people’s preferences, became one of the social network’s most important features. The company allowed other websites to adopt the Like button so users could share their interests back to their Facebook profiles.

That gave Facebook insight into people’s activities and sentiments outside of its own site, so it could better target them with advertising. Likes also signified what users wanted to see more of in their News Feeds so people would spend more time on Facebook.

Facebook also added the groups feature, where people join private communication channels to talk about specific interests, and pages, which allowed businesses and celebrities to amass large fan bases and broadcast messages to those followers.

Adam Mosseri, the head of Instagram, has said that research on users’ well-being led to investments in anti-bullying measures on Instagram.

Yet Facebook cannot simply tweak itself so that it becomes a healthier social network when so many problems trace back to core features, said Jane Lytvynenko, a senior fellow at the Harvard Kennedy Shorenstein Center, who studies social networks and misinformation.

“When we talk about the Like button, the share button, the News Feed and their power, we’re essentially talking about the infrastructure that the network is built on top of,” she said. “The crux of the problem here is the infrastructure itself.”

As Facebook’s researchers dug into how its products worked, the worrisome results piled up.

In a July 2019 study of groups, researchers traced how members in those communities could be targeted with misinformation. The starting point, the researchers said, were people known as “invite whales,” who sent invitations out to others to join a private group.

These people were effective at getting thousands to join new groups so that the communities ballooned almost overnight, the study said. Then the invite whales could spam the groups with posts promoting ethnic violence or other harmful content, according to the study.

Another 2019 report looked at how some people accrued large followings on their Facebook pages, often using posts about cute animals and other innocuous topics. But once a page had grown to tens of thousands of followers, the founders sold it. The buyers then used the pages to show followers misinformation or politically divisive content, according to the study.

As researchers studied the Like button, executives considered hiding the feature on Facebook as well, according to the documents. In September 2019, it removed Likes from users’ Facebook posts in a small experiment in Australia.

The company wanted to see if the change would reduce pressure and social comparison among users. That, in turn, might encourage people to post more frequently to the network.

But people did not share more posts after the Like button was removed. Facebook chose not to roll the test out more broadly, noting, “Like counts are extremely low on the long list of problems we need to solve.”

Last year, company researchers also evaluated the share button. In a September 2020 study, a researcher wrote that the button and so-called reshare aggregation units in the News Feed, which are automatically generated clusters of posts that have already been shared by people’s friends, were “designed to attract attention and encourage engagement.”

But gone unchecked, the features could “serve to amplify bad content and sources,” such as bullying and borderline nudity posts, the researcher said.

That’s because the features made people less hesitant to share posts, videos and messages with one another. In fact, users were three times more likely to share any kind of content from the reshare aggregation units, the researcher said.

One post that spread widely this way was an undated message from an account called “The Angry Patriot.” The post notified users that people protesting police brutality were “targeting a police station” in Portland, Ore. After it was shared through reshare aggregation units, hundreds of hate-filled comments flooded in. It was an example of “hate bait,” the researcher said.

A common thread in the documents was how Facebook employees argued for changes in how the social network worked and often blamed executives for standing in the way.

In an August 2020 internal post, a Facebook researcher criticized the recommendation system that suggests pages and groups for people to follow and said it can “very quickly lead users down the path to conspiracy theories and groups.”

“Out of fears over potential public and policy stakeholder responses, we are knowingly exposing users to risks of integrity harms,” the researcher wrote. “During the time that we’ve hesitated, I’ve seen folks from my hometown go further and further down the rabbit hole” of conspiracy theory movements like QAnon and anti-vaccination and Covid-19 conspiracies.

The researcher added, “It has been painful to observe.”

Reporting was contributed by Davey Alba, Sheera Frenkel, Cecilia Kang and Ryan Mac.

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