YouTube, the biggest U.S. video sharing site, lacks an official presence in China and Chinese users have difficulty accessing the U.S. site, BusinessWeek says
. The potential reasons? Bandwidth shortages and government censorship. Thatâ€™s opening the door for Chinese video-sharing sites like Youku.com, which have to abide by government rules censoring sexual or political content. (When I checked the site today, it featured a video of a guy beating a dog to death with stick. Crimonyâ€¦).