Facebook chief executive Mark Zuckerberg said his hardest job right now is figuring out how to adapt the world’s largest social network to mobile devices.

Bringing Facebook’s features to handheld gadgets is difficult because the user experience is so different than on desktop computers, he said during and interview at the Allen and Co media conference in Sun Valley, Idaho in the US.

Zuckerberg, meanwhile, played down the tribulations of running a newly public company. “Things are not much different,” said the 28-year-old, who started Facebook eight years ago from his dorm room at Harvard University. “I’m focused on building product.” Facebook is under pressure to get more advertising revenue from its mobile service. To bolster the handheld version of its product, the company is developing location-based features that let marketers target users with more relevant pitches.

Concerns about slowing growth have driven down Facebook’s shares almost 20 per cent since they began trading in May.

Zuckerberg was joined at the event by other tech and media executives, including Apple chief executive Tim Cook, Washington Post Company chief Don Graham, and venture capitalist and Facebook board member Marc Andreessen. – (Bloomberg)