Rep. Diana DeGette, D-Colo., asked a series of questions about the spread of misinformation on TikTok, citing a viral post in 2021 that falsely instructed viewers on how to make antimalarial drug hydroxychloroquine from grapefruit and lemon peel.

“What is TikTok doing to try to strengthen its review to keep this information from coming across to people?” DeGette asked.

Chew said misinformation violates TikTok’s rules but acknowledged that the app fails to remove every false post. “I don’t think we can sit here and say we’re perfect,” he said.

“We invest a significant amount in our content moderation work,” Chew said.

2:16

TikTok CEO confronted by lawmakers on tackling misinformation on the app

Rep. Diana DeGette of Colorado said TikTok's plan to tackle misinformation was "not enough" for her.

DeGette later said: “I’m going to stop you right now. I asked you specifically how you were trying to increase your review of this, and you gave me only generalized statements that you’re investing, that you’re concerned, that you’re doing more.”

“That’s not enough for me,” she added. “That’s not enough for the parents of America.”

Facing questions about harmful acts allegedly prompted by TikTok posts, Chew said he supports continued liability protection for social media platforms as a means of protecting free speech.

2:22

Chew says US should 'preserve' section 230

The TikTok CEO said that section 230 has been "very important for freedom of expression on the internet."

Liability protection, stipulated in Section 230 of the 1996 Communications Decency Act, safeguards social media platforms and other sites from legal responsibility that could result from content posted by users.

“[Section] 230 has been very important for freedom of expression on the internet,” Chew said. “It’s one of the commitments we’ve made to this committee and our users.”

“I do think it’s important to preserve that,” he added.

Hours before Chew began testimony on Thursday, China said that a sale of TikTok by China-based parent company ByteDance would require the approval of the Chinese government, the Wall Street Journal reported.

At the hearing, lawmakers asked Chew about the report.

2:45

Shou Chew faces questions on China's reported opposition to sale of TikTok

The House hearing comes as the social media platform with ties to China faces a ban in the U.S.

"Despite your assertions to the contrary, China certainly thinks it is in control of TikTok and its software," said Rep. Michael Burgess, R-Texas. "Is that not correct?"

Chew replied, "TikTok is not available in mainland China, and today we're currently headquartered in Los Angeles and Singapore."

"I'm not saying that the founders of ByteDance are not Chinese, nor am I saying that we don't make use of Chinese employees, just like many other companies around the world," he added.

In an early exchange, Chew faced repeated questions about TikTok’s relationship with the Chinese government and alleged content moderation on its behalf.

Rep. McMorris Rodgers asked Chew about a process known as “heating content,” in which a social media promotes or moderates posts that appear on its platform.

“In your current or previous positions in Chinese companies, have employees engaged in heating content for users outside of China?” McMorris Rodgers asked.

“Our heating process is approved by our local teams in various countries,” Chew responded, noting that potentially controversial content, such as posts about the 1989 Tiananmen Square Massacre, is currently present on the app.

McMorris Rodgers appeared to doubt the veracity of the remark, saying, “I will remind you that making false or misleading statements to Congress is a federal crime.”