"The biggest mistake we've made as a company is betting too much on HTML5," he said.

Facebook is lessening its reliance on the tools and it has built an application better tailored for Apple Inc's mobile software, Zuckerberg said. It's also working on an application for Google Inc's Android system. New features will be available to the mobile service in the coming weeks and months, he said.

Based on the amount of time users spend on mobile, the company should make "a lot more money" via wireless devices than through desktops, Zuckerberg said. Mobile users also tend to be more interactive than desktop users, he said.

The stock extended its after-hours climb after Zuckerberg said Facebook is taking steps to strengthen search capabilities. The company is fielding about a billion search queries a day.

About the broadcaster:

Rosie Tuck is a copy editor at the China Daily website. She was born in New Zealand and graduated from Auckland University of Technology with a Bachelor of Communications studies majoring in journalism and television. In New Zealand she was working as a junior reporter for the New Zealand state broadcaster TVNZ. She is in Beijing on a 2017 Pacific Media Centre international internship with the AUT/China Daily Exchange Programme, in partnership with the Asia New Zealand Foundation. She is working as a journalist in the English news department at the China Daily website.

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