Two days after the 2016 election, Facebook CEO Mark Zuckerberg was asked at a tech conference about the notion his social network influenced the outcome. He said it was a "pretty crazy idea."
Zuckerberg immediately faced sharp criticism for the comment. On Wednesday, he said he regrets having made it.
"Calling that crazy was dismissive and I regret it," he wrote on his Facebook page. "This is too important an issue to be dismissive."
Zuckerberg's post was a direct response to a tweet by President Donald Trump who said on Wednesday, "Facebook was always anti-Trump." In his post, Zuckerberg defended the role the world's largest social network played in the election, emphasizing that more people than ever had a voice during the race.
"Trump says Facebook is against him. Liberals say we helped Trump," he wrote. "Both sides are upset about ideas and content they don't like. That's what running a platform for all ideas looks like."
Facebook has faced intense scrutiny over the possible effect it played during the campaign.
Earlier this month the social network disclosed that during the election, it sold $100,000 worth of ads to inauthentic accounts likely linked to Russia. It also said it's working with investigators as Special Counsel Robert Mueller and his team examine alleged Russian meddling in the presidential race. Last week, Facebook said it's handing over 3,000 Russia-linked ads to the Senate and House intelligence committees as investigators dig into what happened.
Zuckerberg also went on Facebook Live, the company's live video streaming service, to outline ways the social network would try to protect the integrity of elections. He vowed more transparency around political ads, as well as adding 250 people across all its teams working on safety and security.
Facebook has also reportedly been invited, along with Google and Twitter, to testify before a Senate Intelligence Committee panel that's examining how foreign actors may have used social media to interfere with the election.
The Smartest Stuff: Innovators are thinking up new ways to make you, and the things around you, smarter.
Special Reports: CNET's in-depth features in one place.