New York (CNN Business) Mark Zuckerberg pushed back against calls to delay livestream feeds to reduce the reach of troubling content.

In an interview airing on "Good Morning America" on Thursday, the Facebook CEO said a delay "might" have limited the number of views of a livestreamed video last month purportedly showing a gunman walking into a mosque in New Zealand and opening fire.

"But it would also fundamentally break what livestreaming is for people. Most people are livestreaming, you know, a birthday party or hanging out with friends when they can't be together," Zuckerberg told George Stephanopoulos.

He said livestreaming is more than broadcasting -- it's "communicating," because people comment in real time.

"So if you had a delay that would break that," Zuckerberg said.

Read More