The scientist who spots fake videos

nature_Hany Farid discusses how to detect image manipulations — and the increasing sophistication of forgers.

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Eli Burakian/Dartmouth College

Hany Farid.

Hany Farid, a computer scientist at Dartmouth College in Hanover, New Hampshire, specialises in detecting manipulated images and videos. Farid, who provides his services to clients as varied as universities, media organizations, and law courts, says that image manipulation is becoming both more frequent and more sophisticated. He spoke to Nature about the arms race to stay ahead of the forgers.

Where do you start when trying to spot a fake image?

One simple but powerful technique is reverse image search. You give the image to a site such as Google Image Search or TinEye, and they show you all other instances of it. A project at Columbia University, in New York City, is taking this to the next level, and starting to find parts of images that have been repurposed from other images.

“I’ve seen the technology get good enough that I’m now very concerned”

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Vietnamese man fined for posting fake news to Facebook

He claimed three crocodiles had been found along a canal in the Mekong Delta

By Tuoi Tre News

September 01,2017, 11:14 GMT+7

​Vietnamese man fined for posting fake news to Facebook
A screenshot of the status update of Pham Van Toan’s Facebook account, which has been deleted
A man in Ca Mau Province, located in Vietnam’s Mekong Delta, was levied a VND10 million (US$438.4) fine after authorities were notified of fake news being posted from his Facebook account.

The fine was imposed by officials from the provincial Department of Information and Communications on Pham Van Toan, a resident of Thoi Binh Commune, Thoi Binh District.

Toan posted a status on his personal Facebook page under the pseudonym Thanh Toan on August 21 reporting that local residents had sighted three crocodiles along the Zero Thoi Binh Canal at around 11:00 am. Tiếp tục đọc “Vietnamese man fined for posting fake news to Facebook”

Facebook blocks ads from fake news pages

Facebook blocks ads from fake news pages
© Getty Images

thehill_Facebook is blocking pages that post fake news stories from buying ads as part of its efforts to curb hoax articles on its platform.

The company announced on Monday that it would prevent Facebook pages — public profiles for brands, celebrities, groups, businesses and other institutions — that repeatedly share news marked as “false” by third-party fact-checkers from advertising on its platform.

“This update will help to reduce the distribution of false news which will keep Pages that spread false news from making money,” wrote Facebook product managers Satwik Shukla and Tessa Lyons. “We’ve found instances of Pages using Facebook ads to build their audiences in order to distribute false news more broadly.”

The company noted that pages that stop posting fake news would be eligible to buy ads on Facebook again.In the post, the two managers reiterated Facebook’s stance that false information on the platform is “harmful” and “erodes trust.”

In December, the company announced that it would begin taking steps to curb fake stories from spreading across its platform. The move came after CEO Mark Zuckerberg initially downplayed the impact of false stories on Facebook.

“More than 99% of what people see is authentic,” Zuckerberg wrote just after the presidential election. “Only a very small amount is fake news and hoaxes.”

Facebook has since released features and tweaked its platform in a variety of ways to stop fake news from being shared on its website.

Most notably, the company introduced an option that allows users to report potentially fake stories as “false.” Third-party groups assess flagged stories to determine if they are fake. They also use algorithms to find false news stories.

5 cách kiểm chứng sự thật của các tuyên bố về sức khỏe/y tế

English: 5 tips for fact-checking claims about health

“Bạn có thể đưa ra sự thật chính xác 100% nhưng có thể vẫn gần như vô nghĩa đối với độc giả”

Câu nói thứ hai của Gary Schwitzer trong cuộc nói chuyện qua điện thoại của chúng tôi nghe có vẻ như không thực là một sự chấp nhận cho việc kiểm chứng sự thật.

Thực tế, điều này chỉ ra một thách thức mà những người phải kiểm chứng sự thật phải đối mặt hàng ngày.  Những tuyên bố mà các viên chức được đắc cử hoặc các phương tiện truyền thông đưa ra có thể chính xác nhưng lại gây hiểu nhầm do việc bỏ sót hoặc thiếu bối cảnh.  Những tuyên bố này đôi khi thật khó để phát hiện theo mọt cách rõ ràng cho người đọc, nhưng cũng không kém phần quan trọng hơn là những đó là ở đâu đó số liệu bị can thiệp một cách trắng trợn.

Schwitzer là ông chủ của trang và là trợ giảng của  Khoa Y tế cộng đồng thuộc đại học Minnesota. Tiếp tục đọc “5 cách kiểm chứng sự thật của các tuyên bố về sức khỏe/y tế”