Chen made the remarks as he spoke to hundreds of enthusiastic Web users at a forum on Internet developments in Taipei.

Commuters on subways or buses are likely to access videos of between 30 to 60 seconds each, while people traveling on longer train journeys would probably go for files of up to 10 minutes in length, he said.

As Internet technologies develop further, Web sites should provide richer content and greater mobility so users can have access to them anywhere, Chen said.

Chen said that YouTube plans to launch a Chinese-language version in the near future for the convenience of Chinese Internet users.

Currently YouTube is only available in English, but half of YouTube viewers are from countries other than the United States, so there could be a Chinese version in future, he said.

Chen, 29, was born in Taiwan in 1978 and emigrated with his family to the U.S. at the age of eight. He spoke English at the forum since his Chinese is no longer fluent.

Chen set up the video-sharing Web site in San Mateo, California with colleague Chad Hurley in 2005 after they found their video files too large to e-mail.

Within a year of its launch, they sold YouTube to Google for US$1.65 billion.

Chen, wearing earrings and jeans, noted he didn't get any attention when he last visited Taiwan in 2005.

"I had definitely not expected so many photographers," he said.

In 2005, he founded YouTube together with Chad Hurley and Jawed Karim. He is now the Chief Technology Officer in YouTube.

In October 2006, Chen and Hurley sold YouTube to Google, Inc. for US$1.65 billion. Chen received 625,366 Google shares, which are worth US$326 million, becoming a millionaire overnight.

In June 2006, Chen was named by Business 2.0 as one of "The 50 people who matter now" in business. Last month, Chen was named as one of TIME magazine's 100 most influential people for 2007.